Freshmeat page: http://freshmeat.net/projects/routeplanner/
A highway trip planning program that can use interchangable databases (map files). RoutePlanner has two main components: the planning program itself, and the map editor. Eventually, I'll probably add a sanity checking program (to verify that direct routings are, in fact, more direct, etc.). The current releases include two databases of North American highways, one of which is small and woefully out-of-date, the other of which is detailed and not-so-out-of-date.
This project has the following developers:
New HTML Parser: The long-awaited libxml2 based HTML parser code is live. It needs further work but already handles most markup better than the original parser.
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If you're a C programmer with some spare time, take a look at the mod_virgule project page and help us with one of the tasks on the ToDo list!