BIM 
IfcOpenShell
the open source ifc toolkit and geometry engine
twitter.com/BlenderBIM→ #OpenBIM. Go #OpenSource. If you use Revit, did you know that there are 7 rules to follow to export the correct #IFC class? The #OSArch community has helped document it here
#GuíaBIM, para la #Arquitectura Técnica, #BIMAT”, promovido y editado por el Consejo General de la Arquitectura Técnica de España (CGATE)" 248 páginas componen este completo documento https://cgate.es/pdf/wBIMAT_com
Reducing the size of your IFC files ? Follow this tutorial available at http://academy.ifcopenshell.org/optimize-ifc-files/