C/C++ compilers and tools to compile and build for targets
DOS 16/32-bit, RDOS, Windows 16/32-bit, OS/2 16/32 bit, Linux 32-bit (x86), Netware
running on host OS
DOS, Windows 16/32/64-bit, OS/2, Linux 32/64-bit (x86/x64)
Probably the nicest and most complete OpenSource toolset for the Win32API. Provides GUI editors for dialogs, strings, menus, accelerators, bitmaps, cursors, and icons. Provides a VI interface for the editor or allows the user to insert his own editor. Unlike other open source tool kits, this one just works.
Pretty nice improvements in v2.