The technical wiki features information such as STB/IRD and analyzer compliance as well as installation instructions.
Developers may be interested in visiting the OBE IRC channel on Freenode. On IRC you can chat to many other users of OBE from a variety of different broadcasters and operators.
Questions can also be asked on the OBE mailing list: https://groups.google.com/forum/#!forum/obe-discuss
The Open Broadcast Encoder is primarily written in C. The wiki on Github has further information about about coding styles. Licensing is under the GNU General Public Licence Version 2.