Free tools I use for web development

Addons/Plugins for FireFox:

FireBug: https://addons.mozilla.org/en-US/firefox/addon/1843
IE Tab: https://addons.mozilla.org/en-US/firefox/addon/1419
Http Headers: https://addons.mozilla.org/en-US/firefox/addon/3829
Web Dev: https://addons.mozilla.org/en-US/firefox/addon/60

CodeRush Express:
http://msdn.microsoft.com/en-us/vcsharp/dd218053.aspx

PowerCommands:
Plugin for VS 2008 (collapse projects, open containing folder, etc)
http://code.msdn.microsoft.com/PowerCommands

Make IE8 display site as though it were IE7:
http://davidwalsh.name/ie8-emulate-ie7