Jan 31, 2009
That's a really broad question. For editing code, I use Notepad++ on Windows and gedit on Linux. For graphics work, I use GIMP. I use the Adobe Flex SDK for some Flash/Actionscript work (not really my forte). As for Firefox plugins, I use Firebug and Noscript.
My entire development stack is composed of open source or free (as in beer) software.