Since my new Eclipse based IDE for ABL project will eventually supersede Okapi there is little interest for me to continue with it and thought could release it as open-source project. If anyone interested please let me know about your preferences on source code repositories, up until now I've put almost everything on SF.net but nowadays there seems to be other valid options to pick from.
Mind you this is not written in Progress ABL but built using Eclipse RCP, ANTLR parser and have dependencies on UML2 and Acceleo plug-ins.
http://www.ganimede.ro/cms/open-source/okapi/