Since some time I'm involved in the development of Xastir, an Open Source APRS program for X Window, that runs under Linux, FreeBSD, Solaris and Mac OS X. The name Xastir stands for X Amateur Station Tracking and Information Reporting. On the Xastir homepage you could find the last official release (now V1.1) and the current state of the development version. Some mailing lists for discussions are available too.
A few features of Xastir
The following map formats are supported in the moment
inf2geo.pl < mapxyz.inf > mapxyz.geoThis script can be found in the scripts directory of the Xastir sources.
I have created a vector map for Berlin/Brandenburg, if you are interested have a look on my Maps page.