Signal Framework is a Spring-based IoC, AOP, and MVC framework for Java ME (J2ME). It supports both MIDP and LWUIT. The project aims to overcome the limitations of J2ME and deliver an application framework on par with what is available for Java SE.
PrefixDB is a mobile database of callsign prefixes in use by amateur radio. This database is helpful for the radio amateur while on the run. It is especially helpful for portable operations like QRP or handhelds (Echolink, etc.).