7-Zip - Powerful utility to compress and decompress.
Ogre3D - Home of the OGRE 3D library.
Ogitor - Home of Ogitor a free 3D environment editor for OGRE.
The 3d Studio - Good source of free 3D models for non-commercial use.
Blender - Home of Blender the powerful open source 3D modeler.
Code::Blocks - The open source, cross platform, free C++ IDE.
MinGW - Home of the MinGW, MSYS and mingwPORT Projects.
New links can be added here.