xBIM Toolkit was started by prof. Steve Lockley in 2007. Steve made it initially as a personal project while on a career break for a year. When he joined Northumbria University in 2009 the core of xBIM was already developed and it implemented most of IFC2x3. This means Steve developed the core methodology of mapping between EXPRESS schema and C#. He also developed the core infrastructure for data management of any IFC model. All this is good to know when you read our license;
There are about 10 developers in the core of xBIM Team. All of us are keen to keep xBIM ready for enterprise deployment. Part of the team is based on Northumbria University the rest is spread over enterprises who have adopted xBIM as an engine behind the BIM related functionality of their products.
Our GitHub page lists public members of the core team. There are other internal members from the enterprises. If you want to contact us to ask something about xBIM source code we prefer GitHub issues as a way to talk about the code.
Some of the companies using xBIM Toolkit: