What’s finished?
The structure, labels, tables, tokens, reports, the font, a decent chunk of the floating-point routines, and a few other bits and bobs.
What’s missing?
File I/O, colour, pixel manipulation, the editor, some floating-point routines, and quite a lot of other stuff.
How do I get involved?
Go to the SourceForge project page at: http://sourceforge.net/projects/open82.