James' Developer Tools

 Network
Ethereal network protocol analyzer (requires WinPcap)
Tesseract network traffic monitor
NetMon IP connection monitor
TCP View by sysinternals.com
TDIMon Transport Driver Interface Monitor
ItCan.Net Monitor bandwidth analysis utility
 Port Scanning
SuperScan port scanner by Foundstone
LAN Network Scanner port scanner
 Programming
XVI32 Hex Editor
Active State Perl
 Shell Extensions
Rei's More Extension (touch/icons/bitmaps/resources)
PEsx dependency viewer by Johannes Plachy
Hex Viewer by SOLYP Informatik GmbH
RegisterEx OLE Servers tool
 Misc
Dependency Walker by Steve Miller
Process Explorer by sysinternals.com
Portable Executable Analyzer from Johannes Plachy
WCPUID cpu information tool
Resource Hacker view and modify windows resources
 Monitoring
FolderMon directory change monitor
DiskMon disk monitoring
Filemon file monitoring
Portmon serial and parallel port monitoring
Regmon registry monitoring