Get flash to fully experience Pearltrees
Have you customized your Facebook page?
An open-source GUI prototyping tool that's available for ALL platforms. Pencil is built for the purpose of providing a free and open-source GUI prototyping tool that people can easily install and use to create mockups in popular desktop platforms. The latest stable version of Pencil is 2.0.3 with many enhancements and bug-fixes.
Firefox Greasemonkey Script
Since I'm a heavy gmail user, I make significant use of the editor window in my web browser.
Update: This program is very old and was made for Firefox 2.
Ever since we started releasing home - brewed Firefox extensions here at Lifehacker, several readers have asked: How difficult is it to build a Firefox extension? For someone with a bit of programming experience, the answer is not that difficult.