Project to modernize, refactor, and as necessary re-implement the UPS debugger ( http://ups.sourceforge.net/ ).
Current plans are to (1) refactor codebase as appropriate (translating into C++), (2) add DWARF support, (3) migrate from X to FLTK, (4) integrate Parrot to allow scripting a la Plan9's acid debugger (and potentially to lower the barrier to using UPS with other languages), and (5) improve C++ support. Once refactoring is finished, it should be trivial to port to OS X, and possible to port to Windows. UPS was originally released under GPL 2+, this project will be GPL 3.