KD Player is a music player for mobile phones that supports all audio formats. The program can easily replace your standard player, and is constantly updated with new skins
Photog Calc is a tool for photographers to help with some (not so) basic calculations. Currently there is a calculator for a depth of field, an angle of field and a guide number calculations. It is a Java ME software and should work on a CLDC 1.1 and MIDP 2.0 compatible mobile phones