Tweetanium Desktop is also available as an installable package for Mac OS X, Linux, and Windows. Here are the platform specific download links:
If you want to contribute back we require that you sign a standard Open Source Contributors License Agreement (CLA). As with most open source projects, legal issues regarding intellectual property rights require us to protect ourselves, our contributors and our users from any future ownership claims from third-parties.
Thus, you must first electronically sign the CLA before you can contribute code, documentation or any other materials to the project.