Long ago, Lourens Rozema created OpenRabbit, which allows programming Rabbits on Linux. It also has a graphical debugger using ncurses. His goal was to develop for Rabbits on GNU/Linux (using Dynamic C under wine).
Recently, I'm trying to revive this project: https://github.com/spth/OpenRabbit
It now works for me (using an USB programming cable, RCM2200, simple sample program compiled with Dynamic C 9.62A).
However, it still needs a pilot.bin from Dynamic C 8 (I used the one from Dynamic C 8.61).