J4ME is a library to help with J2ME development. It includes a UI framework for professional-looking and intuitive interfaces, a logging framework to help debugging platform-specific issues found on different phones, a Bluetooth GPS integrated into the JSR-179 Location API, and a library of missing J2ME methods and helpful collections for small devices.
BART Tracker reports on arriving San Francisco area BART trains in real time, using a system tray icon. It uses BART's new "Estimated Arrivals" or "BART System Status" feature, which reports on the current up-to-the-minute status of arriving trains at every BART station. It requires Java 6.