Anti-Virus and Anti-Spyware:
Spyware removal:
Registry Cleaner, Unerase, and more:
Startup control:
This is getting somewhat old and should be replaced by something better.
Search by filename (with regex). Requires some hacking to get this to work with Vista and Win 7.
S.M.A.R.T. HD diagnostics:
System Diagnostics and debugging:
User Profile Hive Cleanup (XP only shutdown bug fix)
Disk Defrag:
Photo editor and viewer:
HTML Editor:
Registry backup on bootup (and registry restore):
Backup:
Software and hardware report:
Zip, unzip, and others:
Media Player:
Repair and recovery: