BtFree is a library for creating client-server applications that communicate over a Bluetooth connection. You can use it in your MIDP application or in a Java application that uses an implementation of JSR82. It allows you to create applications with client-server interaction easily, avoiding the need to know JSR82 and the problems related.
Navlet is a navigation system for mobile devices such as PDAs, smart phones, and cell phones. It retrieves positioning data from any NMEA capable GPS receiver and displays the position on a digital map. External GPS receivers can be connected via a serial cable or Bluetooth. If your mobile device is connected to the Internet, it can download maps from a map server, or alternative use locally stored maps. It is also able to send the GPS data to a server via an HTTP connection.
Jeff's Java Scanf Library is an implementation of the C-Runtime scanf, fscanf, and sscanf functions. The syntax of format strings is very similar (%*s, %3d, etc.) to that of the standard C implementation of scanf. Instead of taking wrapper objects, all scanf functions return an Object, whose types can be inferred from the format string.
mgo is a two-player Go game for any Java-enabled device (mobile phones and PDAs). It features boards from 19x19 to 9x9, passing, taking back moves, counting of captured stones and territory (with declaring groups as dead), saving and loading of games, walk through of games in review mode, and very easy in-game navigation. mgo_x extends mgo by making use of additional features (SGF export to the mobile's file system) that are only usable by devices that fulfill the JSR 75 specification. Both (mgo and mgo_x) allow for transferring games to the eogban.org Go community service over the air.