Late entry...
Name: GNUstep
Description:
+ GNUstep is a console, desktop and web application development framework for
+ development using Objective-C. It is based on OPENSTEP specification, and is
+ today interested in achieving compatibility with Apple's Cocoa set of
+ frameworks.
+
+ GNUstep consists of gnustep-base (classes for strings, arrays, dictionaries,
+ timers, sockets, et al), gnustep-gui (classes for windows, buttons,
+ textboxes, et al), gnustep-make (a build system) as well as an assortment of
+ development utilities and bonus libraries.
I'll send my mentor information. Hopefully additional mentors can be added at a later stage, as required.