DeleD - "DeleD is a 3D modeler and level-editor combined into one. It focusses at game development and is specifically designed to create static objects/worlds."

Code::Blocks - "Code::Blocks is a free C++ IDE built to meet the most demanding needs of its users. It is designed to be very extensible and fully configurable."

GIMP - "GIMP is the GNU Image Manipulation Program. It is a freely distributed piece of software for such tasks as photo retouching, image composition and image authoring."

FX Composer - "FX Composer 2.5 is a powerful integrated development environment for shader authoring."