Think! Open Source

FreeBSD is a popular open source OS like linux. It has many variants. The thing which distinguishes it from linux is the license under which it comes. You can use FreeBSD to create your own closed source commercial project, software or OS. While GPL v. 2, the lisence under which linux kernel is distributed requires that you should open source all the modifications and original code as it was open source before.
FreeBSD has launched its official community forums, it would be a good thing for FreeBSD community now, to build and to cooperate with each other will be much easier and productive.

tangoGPS is a fast, lightweight and easy to use application for use with or without GPS. It runs on Linux platform like eeePC and Openmoko phone. It is licensed under GPL version 2. A very interactive interface and ability to download GPS maps for offline use make a very handy application.
Its current version is 0.9.3 and packages for popular distributions are available at official site.

GNU GFDL version 1.3 is released. GNU Free Documentation License is a popular license and co-part of GPL in licensing content and written materials in opensource way. This version is compatible with Commons Atribution-ShareAlike (CC-BY-SA) 3.0 license and now the organizations can move their content from GFDL to CC-BY-SA. The special request of Wikimedia Foundation is now fulfilled and likely Wikipedia project will start discussions now to change the license from Creative Commons Share Alike to GFDL 1.3.

Qt Software has released Qt Creator and IDE to develop Qt based applications. Qt, formerly called Trolltech, is now a subsidiary of Nokia, the cell phone giant of the world. This piece of software is available for Mac, Linux and Windows intially, althogh the license is not GPL yet, but it will be a GPL (like) license in final release. Some nice screen shots you can see.
1, 2 & 3
A more detailed and user oriented review is published on dot.Kde.