Loanr is a simple loan calculator. It's been tested on primary BlackBerry devices and Symbian devices. It's handy to have when looking to purchase a car from a dealer with their frequent jumping back-and-forth from total payments to monthly payments, but also works for other types of loans and less low-pressure situations. The file is unsigned, and may illicit a warning on your device when you try and download it.
Location Source is an implementation of Java's Location API (JSR-179). It is intended to give Java applications access to location data on platforms that do not have a JSR-179 implementation of their own. It currently only runs on Windows Mobile using IBM's WebSphere Everyplace Micro Edition (WEME) 6.1.1 bu can easily be extended to run on other platforms. For example, you could use it on any laptop by tying it into SkyHook's Loci API.
Maptales Mobile is a J2ME/MIDlet client that allows you to log your routes and thoughts on the go, and later edit and publish the data on maptales.com where it can be exported to your Web site, Google Earth, RSS/Atom, and other formats. All you need is a mobile phone that supports Java and a Bluetooth GPS device.
MicroSweeper is Minesweeper-like game intended for J2ME-capable (MIDP 2.0, CLDC 1.1) hand-held devices. The game allows optional determinism, which when turned on, ensures that each mine can be discovered without guessing. Besides the traditional game, it provides a pseudo-hexagonal grid and games with various "neighborhood" patterns, where the number on the field is computed from mines located further from the field itself.