Greetings,
I have released a refreshed port to Plan-9 of my Dynace OO extension to C. This is open-source.
Dynace adds advanced OO capabilities to C including a metaobject protocol, multiple inheritance, generic functions and much more. In Dynace, classes are first class objects. Each class has another class that defines it - its metaclass - just like Smalltalk and CLOS. Dynace also has generic functions and cached dynamic dispatching like Common Lisp's CLOS.
Dynace includes an extensive class library. It also comes with a complete GUI development environment (that portion only runs under Windows or Linux/Mac/BSD/etc. through Wine).
Dynace is extensively documented with two included 300+ page books and a tutorial.
Dynace is portable to 32 & 64 bit Plan-9, Linux, BSD, Mac, Windows & DOS.
You can download the entire source from:
Blake McBride
(P.S. please make sure you get release 20131220 - in case you are seeing an old, cached web page.)