Releases can be downloaded from navit's project page on sourceforge : http://sourceforge.net/project/platformdownload.php?group_id=153410
If you want the bleeding-edge version of navit (recommanded) try the svn repository : http://navit.svn.sourceforge.net/viewvc/navit/
Users's contributed packages
Get fresh compiled cvs snapshots here. (Updated every 2 day or on request).