Info-ZIP portable compression/archiver utilities (Zip, UnZip, WiZ, etc.)
Versatile Commodore Emulator
VICE is an emulator collection which emulates the C64, the C64-DTV, the C128, the VIC20, practically all PET models, the PLUS4 and the CBM-II (aka C610). It runs on Unix, MS-DOS, Win32, OS/2, Acorn RISC OS, BeOS, QNX 6.x, Amiga, GP2X or Mac OS X machines.
This is a group of makefile scripts and templates that helps the developer and end-user to configure, update, and build Allegro/AllegroGL/etc projects, on many platforms, and with different compilers, in a easy way (just type "make" and it will work).
An operating system kernel designed with simplicity, readability, and elegance in mind. No longer written from scratch, but built on "the shoulder of giants." Specifics are given in the CREDITS file starting from v0.04
Both BOR and OpenBOR ports for GP32 and also work being done to add support for DC and PSP for OpenBOR
The Omicron OS Kernel Project, is a another attempt to create an open source operating system. However one fundamental difference between this OS and the others is that, the omicron project will have user useability taken into account right from the begin