Open CASCADE Technology (OCCT) documentation is available in two forms:

Open CASCADE Technology Overview provides a general description of OCCT modules and other features. It includes Installation instructions, User and Developer guides.

Browse Open CASCADE Technology Overview online:

User's Guides describing modules and development tools are also available in Adobe Portable Document Format (PDF). To read this format, you need Adobe Acrobat Reader, which is a freeware and can be downloaded from Adobe website.

Reference Documentation provides a detailed description of all OCCT classes organized in hierarchical form corresponding to OCCT structure (module -> toolkit -> package -> class).

Browse Open CASCADE Technology Reference Documentation online:

Open CASCADE Technology documentation is generated by an open source Doxygen tool and is included in both, Windows installer and source packages.