Open CASCADE includes documentation. But there is a whole lot of non documented information in the cdl files. In fact, the cdl files are often the only documentation that is available for a class or package.
Also, the size and complexity of Open CASCADE makes learning the structure of the library quite a task.
occbrowse.pl is a small cgi script that lets you quickly surf Open CASCADE cdl, header, and source files.
OCCBROWSE is now on-line live here for you to use if you don't want to install it and run a server locally.
OCCBROWSE 0.4 is now available with support for OCC 5.1.
OCCBROWSE works on windows by using apache under cygwin.   Here is howto set it up.
Packages under a Toolkit
Sources of a package
CDL file with cross references
source file with cross references
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