Foundamentals

Basic Free Projects

Linux is a free Unix-type operating system originally created by Linus Torvalds with the assistance of developers around the world
GCC is the GNU Compiler Collection, which currently contains front ends for C, C++, Objective-C, Fortran, Java, and Ada, as well as libraries for these languages (libstdc++, libgcj, ...)
GNOME, a Unix and Linux desktop suite and development platform.
KDE is a powerful Free Software graphical desktop environment for Linux and Unix workstations
Gimp is the GNU Image Manipulation Program
Wine HQ is an Open Source implementation of the Windows API on top of X and Unix.
Samba is an Open Source/Free Software suite that provides seamless file and print services to SMB/CIFS clients
Open Office is a free productivity suite compatible with all major office suites.
Blender and Bender3D (Development)
uCLinux is a port of Linux to systems without a Memory Management Unit (MMU).

FlexWiki
Wix toolset that builds Windows installation packages from XML source code
Windows Template Library (WTL) C++ library for developing Windows applications and UI components
Art of Illusion is 3D modelling and rendering studio. It is written entirely in Java, and should be usable on any Java Virtual Machine which is compatible with J2SE 1.4 or later
White dune is a low level VRML97 tool for Unix/Linux/MacOSX and M$Windows.
Wings 3D is a subdivision modeler inspired by Nendo and Mirai from Izware
Moonlight|3D 3D graphics and animation tool (old?: moonlight3d)
G-House 3D is a free simple architecture 3D modelling program (still in early development) by B.N. Chandan
FacturaLUX una aplicacion informatica que permita desarrollar soluciones para la administracion y gestion de la PYME, asi como distintas personalizaciones que cubran las necesidades de gestion y finanzas de las empresas
k-3D is a free-as-in-freedom 3D modeling and animation system for GNU/Linux and Win32.
AQASIS a free RenderMan compatible OpenSource REYES renderer.