While this may not specifically address mobile GIS/GPS, one very good GIS Linux application that I use occasionally is TNTlite, which is part of a group of programs from MicroImages. (I have _no_ association with the company.) It's not opensource, but is is free for personal use, and is somewhat similar to GRASS mentioned above. (Actually it runs on Unix/Linux, Mac, and win.)
http://www.microimages.com/tntlite/
OpenMap is another free application of interest, although I've found it to be a little quirky.
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While this may not specifically address mobile GIS/GPS, one very good GIS Linux application that I use occasionally is TNTlite, which is part of a group of programs from MicroImages. (I have _no_ association with the company.) It's not opensource, but is is free for personal use, and is somewhat similar to GRASS mentioned above. (Actually it runs on Unix/Linux, Mac, and win.)
http://www.microimages.com/tntlite/
OpenMap is another free application of interest, although I've found it to be a little quirky.
http://openmap.bbn.com/whatis.html