Construction Management

8 Best Free and Open Source BIM Software Tools

Published by in Construction Management

It will only be a matter of time before your construction business (no matter how small) will start using building information modeling, otherwise known as BIM.

While BIM advocates will be quick to tell you all about its advantages, certain clients, notably in the public sector, aren’t simply relying on carrots to persuade you to become a BIM shop. Governments across the world are making BIM and BIM software a mandatory part of bidding for contracts and undertaking building projects.

Your choice will not be if, but how you use it.


In the world of construction management software, there are always solutions that are available for free or that use open, non-proprietary code to help you avoid being locked into a particular software supplier.

BIM is no exception. The challenge is in choosing a free and/or open source BIM application that fits your needs.

Before we jump into these open source and free BIM software options, we’ll take a look at some of the advantages of using a BIM tool and the different types of BIM tools with varying degrees of complexity. Then we’ll look at some specific options for each type.

What is this “BIM” anyway?

Building information modelling is a process to help manage complexity and improve performance in construction projects. Using BIM as a software application gives users the following advantages:

  • 3D visualization of buildings. Your construction team can work better together, as well as with customers and subcontractors. Spot and correct errors in 3D designs before they happen in real life, or fix them faster afterward.
  • Change management. Alterations to building structures and furnishings can be automatically checked, conflicts identified, and quality improved.
  • Construction simulation. Try out different designs and optimize for the best cost-performance ratio while ensuring overall construction soundness and safety.
  • Data management. Attach different kinds of project data (schedules, photos, scans of handwritten notes) to be able to find it all again in one place.
  • Operational management. Check building performance (energy consumption for example) over the lifetime of a building and improve efficiency in remodels and extensions.

Many users and software developers stop at the first benefit. They consider BIM to be a kind of glorified computer-aided design (CAD). Yet BIM can go well beyond a static 3D drawing on a screen to help to reduce costs and accelerate construction schedules. And there are free and open source BIM applications that offer some of the advantages listed above.

This article looks at eight highly rated free BIM software options. See the full list of free BIM software solutions here.

Reasons for considering free or open source BIM software

At first glance, it seems obvious. “Free construction software” should help you save money. However, as any IT manager will tell you, initial software costs are often a small proportion of the real cost of using software, including staff time and effort to learn and use it. “Free” should be interpreted with caution!

BIM applications built on open source software offers their own set of benefits:

  • Open source software typically uses open standards in its design and interfaces. This can make the exchange of BIM data with customers, partners, and suppliers easier.
  • Open source software also allows you to modify the program itself (if you want to). You could, for example, change the user interface, add your own special functions, or make the program interact in new ways with other parts of your IT architecture.

Construction manager or software geek?

Software applications increasingly drive construction management and building work in general. But does that mean you have to know what goes on under the hood? Commercial BIM applications often take pains to shield users from this and charge you for it accordingly. The business logic is that you should get more value, faster, for your construction company because you don’t have to worry about the inner workings of your software platform.

Vendors of free software, on the other hand, may not have the same business perspective. Depending on how deeply you want to get into the software itself, you may prefer to pay for a packaged, user-friendly solution. Or perhaps you want to make the effort required to exploit the power and flexibility of certain free or open source solutions.

To help you decide, we’ll categorize options for free and open source BIM software into the following types:

  • Free BIM viewer. Although BIM advantages can go much further (see above), an application to view 3D models of buildings can help to get workers and customers into the mode of using BIM.
  • Standard office application-based BIM. Business information modelling may sound complicated, but sometimes a standard spreadsheet is all you need.
  • BIM as a bolt-on for CAD software. While purists argue that BIM software should be designed and built separately, this can be a pragmatic way of getting into building information modelling.
  • The BIM software toolkit. A software toolkit can be adapted or used to build a variety of BIM solutions, including extensions to existing applications. However, that means possessing or having access to the relevant software programming skills.
  • BIM from the start. In this case, the BIM software has been built expressly for building information modelling. Instead of trying to twist 2D or 3D drawings into BIM, this kind of BIM application gives you digital building blocks from which to make adaptable, purpose-built BIM projects.

Free BIM Viewer


Screenshot of BIMx from Graphisoft

BIMx from Graphisoft is available free of charge for Android and iOS devices.

As an interactive 3D communication and presentation tool, it lets users upload a 3D drawing and explore it. Construction companies can take advantage of BIMx to:

  • Show customers what they will get, and why they should sign that contract (now!)
  • Show workers on site what the end result will be and therefore how each intermediate step should contribute to that result
  • Get precise feedback from workers and supervisors about any problems in the construction process by indicating where in the drawing the issue is occurring.

An iPad or Android tablet offers mobility, as well as a camera for taking pictures of problems and the ability to attach accompanying notes (although the website says that the free app is for viewing only and mostly intended for clients). BIMx also won a mobile Product of the Year Award as a testimony to its quality and user friendliness.

Another option is BIM Vision, a freeware IFC model viewer that allows the user to view virtual models created by systems such as Revit, Archicad, Advance, DDS CAD, Tekla, and Nemetschek VectorWorks, just to name a few. IFC stands for “Industry Foundation Class,” which is another kind of data model for describing building and construction industry data.

The software allows for lots of tweaking of the 3D model, including coloring elements based on the type, setting the transparency level for creating cross-sections, and comparisons of models to show the geometry changes and element properties. You can also load multiple IFC files in one view for side-by-side comparisons.

BIM Vision works on a PC or tablet with Windows 7 or newer, so Apple users are out of luck.

Standard office application-based BIM

Image from Practical BIM

Image from Practical BIM

Do Microsoft Excel and the free OpenOffice Calc qualify as BIM software? According to initiatives such as COBie (Construction Operations Building Information Exchange), the answer is yes.

COBie is a data format designed for the capture and recording of important building project data.

The data can be recorded in a spreadsheet, which can then be used as input for other software applications. In June 2011, the UK government set out a five-year plan to bring 3D BIM in for all its construction projects (PDF). The requirement for the first year was COBie: a “spreadsheet containing as much information about a building in as complete and as useful form as possible.”

COBie and similar data formats also highlight another interesting point. BIM isn’t only about 3D drawings. In fact, BIM can also exist without any such drawings at all as information in a COBie spreadsheet.

BIM as a bolt-on for CAD software


Screenshot of FreeCAD

BIM and engineering CAD software are two different approaches to building design.

In a perfect world they would stay separate. However, in the real world, compromises are sometimes necessary in order to get building projects done. FreeCAD offers such a compromise. It is a CAD program that offers BIM functionality as an extension to help users handle BIM as a process.

In particular, FreeCAD offers “IFC compatibility.” FreeCAD also states that its functionality can be activated and driven by other software programs written in Python. Python is reputed for its relative user-friendliness, but for most people, it’s “geek-speak” all the same.

In summary, FreeCAD offers a way for users already familiar with CAD to get a head start along the road to BIM, but those without any software programming knowledge may find it tough going.

The BIM software toolkit


Screenshot of xBIM

The phrase “software toolkit” instantly indicates a need for some serious software engineering capability in order to get any further. The challenge is to make the connection between the software constructs and terminology and a practical solution that helps your construction business. Unfortunately, some free toolkits or platforms seem to get stuck at the software stage.

xBIM (eXtensible Building Information Modeling) makes an effort to help users cross over the chasm and get to business value. While created as a software development toolkit, it offers practical examples of use in real life building contexts. It may take a software engineer to figure out the references to middleware and APIs (application programming interfaces), but other aspects are easier to understand:

  • xBIM makes it relatively easy to manipulate the IFC building elements. You can work with beams, panels, doors, windows, teams, processes, and other “real life” entities to make a BIM representation of your construction project.
  • xBIM offers the ability to create new functions to extend the possibilities of commercial BIM tools such as Autodesk Revit.
  • Sample applications based on xBIM are available. For instance, the iCIM (Interoperable Carbon Information Modeling) online tool lets designers assess the carbon impact of their design decisions throughout the lifecycle of a building.

Another option is BIMserver, which was created on the premise that no two construction projects are the same, and therefore construction managers need focused applications that can do one thing very well.

BIMserver is a platform that allows you to build a niche application perfectly suited for your project, although you’ll need some programming expertise to get started. The software is published under the GNU Affero GPLv3 license, so it’s free to use and modify. You can use this software to create your own BIM tool from the ground up, or modify other tools out there to fit your unique situation.

BIMserver’s core features include storing all revisions, open BIM standards, cloud capabilities, lots of interfaces, and a plug-in framework for easier fine-tuning, to name a few.

BIM from the Start


Screenshot of B-processor

An intuitive free BIM offering in this category is “B-processor.”

B-processor has been created from the start for BIM, and not as an add-on to a CAD software product. The 3D modeling of a building is relatively simple to learn. As spaces (such as rooms) and structures (such as  walls) are put into place, users add further information (“tags”) to each element to describe its properties and function. These tags can then be used to provide total cost information, cost breakdowns, carbon footprint data, alerts about design conflicts, and more.  

B-processor also keeps manipulation of each model simple too, with the possibility to define:

  • “Modelers”: tools for repetitive tasks and the creation of detailed elements
  • “Evalors”: tools for processes such as calculating areas, energy consumption, and structural properties.

Another BIM project, 4BIM, offers similar “native” BIM functionality, this time as an online software service. As an open source solution, it too has its sights set on practical functionality to help designers and builders.

  • An online viewer for 3D BIM models with access from a standard web browser. Construction project members are able to use the 3D BIM models without any significant learning effort.
  • An online review system for the data attached to a BIM model, following the IFC model of standard data formats and constructs.
  • Collaborative teamwork functions to view, merge and further process multiple BIM files, with tracking of changes in models and alerts about such changes being made.
  • A reporting system to pick out useful information now and in the future, such as the information for a bill of quantities or the highlighting of project conflicts.
  • A facilities management handover service to make relevant information available to clients or other parties, using the standard COBie 2 (see above for COBie) data format.
  • A mobile application for Android and iPhone/iPad device users to access and interact with BIM data in a project.

4BIM offers most or even all of the BIM benefits listed at the beginning of this article, without making builders jump through any software engineering hoops.

Meanwhile, back at the commercial vendors ranch…

Credit where credit is due; commercial CAD solution vendors such as Autodesk and Nemetschek (maker of Graphisoft, among other products) have also actively promoted common building data formats. This makes it easier to exchange such data between different programs.

The initiative to define the Industry Foundation Classes (IFC) started in 1994 when Autodesk formed an industry consortium on the subject. The consortium then became a nonprofit industry-led organization to develop and maintain IFC specifications, and is now called buildingSMART, the eight tool in our list.

Independently of how commercial vendors view free and new solutions such as 4BIM, open standards to help interworking are in everybody’s best interest.


Building information modeling is increasingly part of any and all construction activities. While some clients choose to make it mandatory, BIM offers benefits to all players in the construction industry, whether they are architects, designers, engineers, or builders. This is as true for smaller companies as it is for larger ones.

Free and open source BIM software must be selected with care however. In this case, the size of the user’s organization does matter. Smaller construction companies may not have the internal software skills or resources to work with some of the more complex open source BIM programs or toolkits. Even larger companies will need to size up the effort required to put such programs to practical use. On the other hand, other free and open source solutions such as BIMx, B-processor, and 4BIM offer real possibilities to become part of the BIM scene and to do better business because of it.

Are there any other free BIM software options that I missed? Leave your thoughts in the comments below and be sure to leave a review!

Looking for Construction Management software? Check out Capterra's list of the best Construction Management software solutions.

About the Author

Dan Taylor

Dan Taylor

Dan is a content writer at Capterra, specializing in hotel management, construction and real estate. Outside the office, he enjoys spending time with his family and friends, catching up with the latest offering from HBO or paying a visit to a new place.



Comment by Ana on

This is fantastic article. An awesome platform .

Comment by Xavier Vila on

Very useful article for companies that are not taking yet the step to a change that will be mandatory.

It is clear that the main disadvantage is not the cost, difficulty or access to tools and free software that is available but the limited perceptions of what BIM is. BIM is not limited to implementing the use of a new tool or having access to so many resources, but is a strategic decision of a company to change its processes and concepts.

Thank you very much,

Comment by ACCA software on

Hi All,

we are very pleased to announce that ACCA software is about to launch usBIM, a visual system for BIM management with model creation and management in open formats.
usBIM allows users to build and manage the entire BIM model with open formats (IFC, PDF, XML, etc) and directly online with a cloud based solution. It supports the integration of open digital platforms, plug-ins and software (BIM authoring/BIM tools) able to create and manage digital BIM models during the building’s entire life-cycle.
There is much more to discover about usBIM. If you want to learn about it, please feel free to visit our web page:

Comment by Steve Jepson on

BIM yes. IFC and the openBIM/buildingSMART alliance standards ? not so much.
I am still waiting to learn about some reason it has any advantage over the options we already have. It seems to me that it is only useful in collaborations between BIM Authoring programs at a Project Controller level, when that condition exists. Down at the trade-to-trade level of communication, coordination everyone much prefers to work with a file format that is integral with the programs they must work with. Typically, .dwg, which is arguably the industry standard and is also a 3D file format. They are not interested in duplicating their work for the sake of implementing the openBIM/buildingSMART alliance standards. Also, there is a political component to the openBIM/buildingSMART alliance that in my view is overtly Globalist-Socialist and anti Free-Market Capitalist. I see is as THE mechanism for implementing the diabolical Agenda 21/2030 ambitions to control the economy of all built environments on earth and facilitate the end of private property. No? Check it out for yourself. Beware, what is presented as voluntary today will be mandatory tomorrow. And it already is in some places. As long as it remains voluntary I don’t care if anyone uses it or not. The reason to evaluate the technical pros and cons is because if they don’t make sense, the it lends credence to the idea that this is being pressed in the market place as a political agenda. Everything in our world today has become a political issue. This is because we are in the throes of a Global war between Socialism and Capitalism. The building industry is perhaps the largest economy on the planet, and this is what makes it the target for the Globalist-Socialist agenda. Just some food for thought.

Comment by Clive Jordan on

Lot’s of people start a BIM project with:

1) BIM Execution Plan (BEP or BXP)
2) Model Progression Specification (MPS) / Model Production and Delivery Table (MPDT)

The combination of 1) and 2) above help outline the who/what/when/how for BIM.

We’ve found that we can simplify and integrate this workflow using the LOD Planner platform:

Here are some webinars about this BIM planning tool:

Comment by devlo on

B-processor needs a Windows exe. installer! Actually as its obviously aimed at Linux/Unix, any chance of a Mac version?

Comment by kate on

The programs are written in the BIM technology and they include modules for architecture, constructions and installations. The company has got its own distribution network and uses it to sell its author’s programs and also other manufacturers’ programs, such as IntelliCAD, whose distribution is allowed by membership in the IntelliCAD Technology Consortium, and ArCon, among others


Comment by Petri Kokko on

Very nice article, and i got interested of B-processor application. I did download all the needed java components and when starting the app, only the splash screen got visible. After that it simply got closed.
I tried to contact those developers, but their emails are not working anymore and emails were returned by “un-known address”.
Latest update is done 2015 on source-forge, and windows files are from the year 2013.
-> I think that this project is dead. Please inform me if I’m wrong.


Comment by builderstorm on

You can also try our Software For Building Construction also, we also provide the software that is very user-friendly and can be operated on any of device as per in terms of use .
visit us :

Pingback by The Top 8 Free and Open Source BIM Software Tools – Capterra Blog | Total BIM Makeover on

[…] Source: The Top 8 Free and Open Source BIM Software Tools – Capterra Blog […]


Comment by Morten Madsen on

Glenn Stock, we actually have quite a few customers doing BIM for facility management. The rutine is usually “draw with Revit, improve with metadata in Dalux”.
Floor plan and geometric room properties such as room outlines and size is being synchronized from the model to our FM platform. Next, the customer adds new or existing metadata such rental management and CMMS data. Importing CMMS data from a construction model involves a handover to control the data quality. This cannot be done effectively in the BIM modelling software available today though, so we also provide a solution for that.

Comment by Mark Schipper on

BIM’s benefits are often described into designing and constructing a building more efficiently, but it can be so much more than that. Imagine not just a building but a whole city modelled with BIM. Add the Internet of Things to it and you basically monitor, analyze, and regulate the (autonomous) traffic..or the smart grid derive greenhouse gas emissions to make ‘the polluter’ pay.

@ Glenn: First of all, you can just develop your own software that somehow interacts with the BIM model, to suit it your purpose. Advantages for facility management I can think of are:
– be notified when an appliance (connected to internet) in a building is malfunctioning
– knowing when a building component or appliance has reached its end-of-life, you can schedule its replacement
– you can simulate an addition or alteration to the building, and see how the new situation will be.
– in spite of privacy, you could perhaps even know when is in the building, and who was in it and for how long.

Probably a lot more, and it can all be programmed. Use your imagination!

Comment by Glenn Stock on

Yes yes, it all seems very nice and appears to do everything but make your coffee for you when you sit down to your desk each morning. But let me ask you this, does BIM actually assist with you running a large number of buildings (over 15,000) from a Facilities Management perspective? I have read through the tutorials and although I am impressed I still need to be convinced that I can upload my data from a CMMS and have everything work from BIM, frequencies of inspections, assets with due dates highlighted prior to their inspections, work orders of the Reactive, Routine and Corrective type. I haven’t seen anything yet in the tutorials talk about this. What I have seen a lot of is Construction, Drafting talk where the building has been created from the beginning, can anyone who works in this software talk to me about the benefits of using BIM from a Facilities Management perspective?
Thanks in advance.

Comment by Nick Doddle on

Would BIM be available or extensible to any kind of object that can be built – like toasters, cars, submarines? Or any kind of object that wants to be monitored, like ants hills and badger caves?

Pingback by The Top 6 Free and Open Source BIM Software Tools – Capterra Blog – BIM Level 2 on

[…] Source: The Top 6 Free and Open Source BIM Software Tools – Capterra Blog […]

Comment by John on

Bim models helped us a lot in our business

Comment on this article:

Comment Guidelines:
All comments are moderated before publication and must meet our guidelines. Comments must be substantive, professional, and avoid self promotion. Moderators use discretion when approving comments.

For example, comments may not:
• Contain personal information like phone numbers or email addresses
• Be self-promotional or link to other websites
• Contain hateful or disparaging language
• Use fake names or spam content
Your privacy is important to us. Check out our Privacy Policy.