A reverse engineering suite (decompiler, editor, debugger and more)
A free C, C++ and Fortran IDE
Rapid applications development tool and libraries for FPC
ECLiPSe Constraint Logic Programming System
A native Windows port of the GNU Compiler Collection (GCC)
Homebrew toolchains for wii, gamecube, 3ds, ds, gba, gp32 and psp
GDB pretty printers for boost
C library, that logs memory changes made by malloc and free.
A library for monitoring the garbage collection of app objects
Superseded by http://www.ti.com/tool/msp430-gcc-opensource