Comment Re:It Depends (Score 1) 228
BST (Brad's Spin Tool) - GTK Editor, separate executables for program loader and compiler. Free as in free beer, not open source, though.
http://www.fnarfbargle.com/bst.html
PZST (Propeller Zone Spin Tool) - Qt Editor, uses Brad's loader and compiler. Free as in free beer, is open source (not sure which license)
http://code.google.com/p/pzst/
There is also an open source SPIN compiler now, if you don't want to use BST
http://code.google.com/p/open-source-spin-compiler/
SIDE (Simple IDE) - Qt IDE. I think this is mostly focused on C.
http://code.google.com/p/propside
GCC is WIP, with the Propeller and upcoming Propeller 2 as targets.
Cheers