Vvvv - vvvv is a graphical programming environment for easy prototyping and development.
HEY - Email at its best, new from Basecamp.
Processing - C++ and Java programming at the speed of thought.
Horde - Horde Groupware is a free, enterprise ready, browser based collaboration suite.
Vuo - Design and build live interactive media.
InstAddr - Disposable email address application.