Image

Gimp – image editor
PhotoFiltre – image editor
Paint.net – image editor
ArtRage – image editor
Artweaver – image editor
IrfanView – image viewer
Picasa – image viewer
XnView – image viewer
FastStone Image Viewer – image viewer
FuturixImager – image viewer
Easy Thumbnails – create thumbnails from images
JoJoThumb – create thumbnails from images
iWebAlbum – create web photo albums
JAlbum – create web photo albums
3D Box Shot Maker – design quality box shot
FastStone Capture – screen capture
WinSnap – screen capture
3D

Blender3D - 3D renderer
3Delight Free – 3D renderer
SketchUp – 3D modeling
Maya Learning Edition – 3D modeling
Developers

AutoIt – task automation
SciTE4AutoIt3 – text editor for AutoIt
AutoHotkey – task automation
PHP Designer – PHP editor
Notepad++ – text editor
ConTEXT Editor – text editor
PSPad – text editor
FoxEditor – text editor
Crimson Editor – source code editor
Elfima Notepad – text editor
Notepad2 – text editor
Nvu – HTML editor
Alleycode – HTML editor
BlockNote – web page editor
Weaverslave – web page editor