Useful links

Operating System Review of Operating Systems Open Source Operating Systems for Handheld Devices
GCC The C Compiler
djgpp GNU Utilities for Windows
SmartEiffel The GNU Eiffel compiler home page
Self The power of simplicity's Home Page
IO Prototype language with VM
Omega The Omega language
Lisaac Lisaac on Wikipedia (French)

Editors that support Lisaac (plugins in the Lisaac tarball)

Vim Vim the editor
Kate KDE Advanced Text Editor
Emacs GNU Emacs
Kdevelop KDE development environment (in progress...)