microsoft/ifc

IfcPlusPlus is an open source C++ class model, as well as a reader and writer for IFC files in STEP format. Features: Easy and efficient memory management using smart pointers. Parallel reader for very fast parsing on multi-core CPU's. Additionally, there's a simple IFC viewer application, using Qt and OpenSceneGraph. It can be used as starting point for all kinds of applications around the open building model standard IFC.

Reading and writing IFC files with Javascript, at native speeds.

C# classes to generate and parse OpenBIM IFC files

Examples to demonstrate use of https://github.com/jmirtsch/GeometryGymIFC classes

IFC format specification

A .NET library to work with data in the IFC format. This is the core component of the Xbim Toolkit

Open source IFC library and geometry engine

STEPcode (formerly NIST's STEP Class Library) is used with IFC, STEP, and other standards that utilize the technologies of ISO10303 (STEP). It generates C++ and Python from EXPRESS (10303-11) schemas. The code is capable of reading and writing STEP Part 21 exchange files. It also utilizes Parts 22 and 23 (SDAI and its C++ binding).

Development of the next generation of Industry Foundation Classes