I developed stuff around IFC with C# and Linq, using the xBIM open source project.

I also created a personal standard for working in SQL with IFC storage: a simple and effective meta-model, which I called IFCX, based on dynamic classification. This made it possible to create self-translated trans-cultural objects, synthetic objects, since the classification engine made an aggregate of properties with the properties of PSETs and typing objects, but also detailed, because the aggregate never lost the origin properties.