Gebabbel
From OpenStreetMap Wiki
Gebabbel is a GUI frontend to GPSBabel. It's available as free software for Linux, Mac and Windows. It simplifies the usage of GPSBabel.
If you have questions, you can ask User:SlowRider. The program along with the source code is available under the GPL.
Development
Written in C++ using Qt
Available in English, German and French
Project is on sourceforge: http://gebabbel.sourceforge.net/