For example:
- source control: git + adobe drive
- 3d: google sketchup -> *.dae -> blender -> *.obj
- 2d: photoshop/illustrator -> *.png
- audio: audacity -> *.caf
- code: ArgoUML, Xcode, Textmate
- test: OCUnit
- build: rake, Xcode
Feel free to mention any other tools that you think are awesome :)
Changed to Community Wiki