IfcOpenShell is a software library that helps users and software developers to work with the IFC (Industry Foundation Classes) file format. The IFC file format can be used to describe building and construction data. The format is commonly used for building information modelling. IfcOpenShell uses Open CASCADE to convert the implicit geometry in IFC files into explicit geometry. At the time of writing, IfcOpenShell provides an importer for Autodesk 3ds Max, an importer for Blender, and a stand-alone application to convert an IFC file into a Wavefront .obj file. Furthermore, software developers are explicitly encouraged to use the IfcOpenShell library in their own applications.