- OpenOffice or MS Office for document solutions
- A PDF creator for distributing documents (OO has a build in converter)
- A code-editor other than SED for various reasons. I own Visual Studio but I kept on my personal favorite: ConTEXT. I stay on VS for DLL and C++ programming.
- Tortoise SVN if you rely on Revision Control (SVN is the successor of CVS; but it depends on personal needs - artists would choose AlienBrain or such)
- A 2D graphics program of your choice (arguing which program is better is senseless when a user is able to make stunning graphics with a program which is dismissed by others
)
- DDS converters: NVidia Texture Tool and ATI Compressonator
- Wings3D
- Milkshape 3D
- one prominent commercial modeling package or blender. If you are a student, you get stunning discount prices, e.g. on Cinema4D R10
- Tattoo for skinning. This is the only freeware tool the features paint-on-UV-map-by-painting-on-the-model. DeepPaint3D and BodyPaint are commercial solutions which are far better and feature rich.
- LithUnwrap for skinning. I prefer the skinning feature of WIngs3D over LithUnwrap, but it has also its strengths.
- Audacity
- VirtualDub and any other video software of your choice. In combination with FRAPS for taking ingame videos. Or Taksi, which is a bit slower, though - but free.
- FolderShare - a p2p client which makes it easy to share folders between teammembers (if you dont have a FTP or a SVN server)
- Harry's FontGenerator
- if you are into OOP or are used to plan your software before you program it
, try FUJABA as UML modeling suite (free)
- for JAVA apps (tools, etc.), use Eclipse
- HelpNDoc for documentations and manuals
- DDS and TGA thumbnails previews for the Windows Explorer shell
there are a lot of other tools, but I guess most in my list are not listed above
[EDIT] and COFFEE!