Workshop
Here in the Workshop we publish Open Source and testing phase projects, in order to get feedback from the community.
Sparebrain

Sparebrain is a simple and functional to-do and task manager. It's available in English, Spanish and Klingon. It's developed in Java and runs on Windows, Linux and Mac OS X. It's made available under the terms of a GNU Affero GPL License.
Download: Sparebrain · Sparebrain for Mac OS X · Source Code · Technical documentation (Spanish)
