ccPublisher is a tool that does two things: it will help you tag your audio and video files with information about your license and it allows you to upload Creative Commons-licensed audio and video works to the Internet Archive for free hosting.
CDE is a tool that automatically packages up the Code, Data, and Environment involved in running any Linux command so that it can execute identically on another computer without any installation or configuration. The only requirement is that the other computer have the same hardware architecture (e.g., x86) and major kernel version (e.g., 2.6.X) as yours. CDE allows you to easily run programs without the dependency hell that inevitably occurs when attempting to install software or libraries. You can use CDE to allow your colleagues to reproduce and build upon your computational experiments, to quickly deploy prototype software to a compute cluster, and to submit executable bug reports.
Chickenfoot for Firefox: Rewrite the Web
Simplenote syncing note-taking application, inspired by Notational Velocity and ResophNotes, but uglier and cross-platformerer.
Using this tool, you can freeze a running application (or part of it) and checkpoint it as a collection of files on disk.
An open source tool to generate a complete backend from a MySql database.
csscss will parse any CSS files you give it and let you know which rulesets have duplicated declarations.