a multi-platform C++ GUI toolkit. It is a product of Troll Tech. It is supported on all major variants of Microsoft Windows and Unix/X Windows. (BEWARE OF THE LICENSE)
a graph editor and a C++ algorithm library essentially concerned with planar graphs. The editor is particularly intended for graph theoretical research.
a simple client and server to allow the forwarding of Lan packets over the Internet or in an intranet network. It was made to play multiplayer games with no direct IP connection when players are not in the same local network
a Virtual Globe and World Atlas. Marble offers different thematic maps: A classroom-style topographic map, a satellite view, street map, earth at night and temperature and precipitation maps. All maps include a custom map key, so it can also be used as an educational tool for use in class-rooms. For educational purposes you can also change date and time and watch how the starry sky and the twilight zone on the map change.