API & O/S Internals

ActiveX/COM Inspector
Greatis WinDowse
Holodeck
.NET Component Inspector
Sysinternals
TracePlus Win32
WinHex

Archive Utilities

PowerArchiver
UltraISO
WinImage

Audio

Adobe Audition
Audio Mentor

Builders & Wizards

RegexBuddy

CD & DVD

Alcohol 120
Ahead Nero
AnyDVD
DivX
Roxio Easy Media Creator

CSS, DHTML, HTML

Adobe Dreamweaver
CodeCharge Studio
CSE HTML Validator
Sothink DHTMLMenu

Databases/Libraries/Tools

DBACentral and Database Designer
MySQL

E-Mail Conversion

Aid4Mail

Environments/Languages

Borland
Eiffel ENViSioN!
Perl
PHP
Ruby
Microsoft Visual Studio, VS.NET, MSDN
WinDev
WinBatch

Environment Libraries/Tools

Developer Express
RemObjects

Internet Utilities

Operating Systems

FreeBSD (for servers)
Mandriva Linux
Microsoft Windows
Ubuntu (for desktops)

O/S Utilities

Acronis TrueImage
EF Duplicate Files Manager
Folder Watch
Macro Express 3
PerfectDisk
PE Explorer
PowerDesk
Process Explorer
Registry Mechanic
Super Flexible File Synchronizer
Sysinternals

PDF

AutoBookmark, AutoSplit...
CanOpener, AcroButtons, AcroDialogs
PDF Explorer

Project Build / Test / Package

Security

Nessus
pfw

Sniffing

CommView
Ethereal
TracePlus

Source Code Edit/Diff

Araxis Merge
CodeRush
Dreamweaver
Visual SlickEdit
Eclipse w/JSEclipse
WinHex

Text Indexing

dtSearch

Validation

CSE HTML Validator
W3C CSS Validation
W3C Markup Validation Service

Virtualization

Parallels Workstation
Virtual PC
VMware
Xen

Web Client Debugging

Fiddler HTTP Debugger
FireBug
IE Inspector
Internet Explorer Spy by Ehsan Akhgari
Microsoft's IE Developer Toolbar
Venkman JavaScript Debugger and Venkman Intro
Web Developer Extension
Web Development Helper
Xyle

Words

Oxford English Dictionary
WordMenu
WordWeb Pro