Library to control radio transceivers and receivers
The Hamlib project's purpose is to develop flexible and portable shared libraries that offer a standardized API to control any radio oriented equipment through a computer interface.
The SBS1 Explorer application features a nice GUI allowing a variety of queries to any SBS-1 flights database without having to install the BaseStation software. Simply get a database file (usually BaseStation.sqb) and open it in SBS1 Explorer.
Software Defined Radio Transceiver project is written in Python while using GNU Radio and USRP. The goal is to create a software HF transceiver with various modes. Go here for more info: http://apps.sourceforge.net/mediawiki/sdr/index.php?title=Main_Page