Xastir is program for receiving and plotting APRS™ position packets. Development is a collaborative effort of programmers and amateur radio enthusiasts from around the world. Xastir supports many map formats and is highly customizable. Check out the "Screen Shots" link to see just a few of the ways that Xastir can be used.
Xastir runs on Windows/MacOSX/Linux/FreeBSD/Solaris/Lindows, with many more possible. It supports 125 map formats, several types of TNC's and weather stations, Festival speech synthesizer, AX.25 networking (Soundmodem/Baycom/SCC!) and seven languages!. On Unix-like operating systems, you can run your weather station or global positioning system (GPS) on a separate computer as well, which is good for those hams who are already short on serial ports.
These details are provided for information only. No information here is legal advice and should not be used as such.