Pilot-DB - freeware (OpenSource) database program for the Palm OS (any version and any hardware) and compares with the best commercial programs available.
It supports the field types string, boolean, integer, float, calculated, date, time, note, list and link
Python for S60 (PyS60) - Python for S60 (PyS60) brings the power and productivity of the Python programming language to the S60 platform. The tools enable rapid application development and prototyping, and the ability to create stand-alone S60 applications written in Python
iniEditor - It's very useful as a developer to use .ini files to store settings of apps or MortScript scripts.
Unfortunately, you may have so many complicated settings (check IPTWeather for instance), that you or newbies would like to be able to edit those settings without having to open the .ini configuration file
PeerDroid is the porting of JXME protocol to Android platform. It allows the Android developers to create application for Android platform that uses the features of JXTA system along with Android potential, interacting with other mobile terminals and other traditional peers (Personal-Computer)
MortScript interprets a (quite) simple batch language. If you know .bat files in DOS or shell scripts: it's something like that. Its focus is to remote control or launch other applications, not to write real applications. I.e., you can't do complex dialogs or graphics with it
Composite UI Framework for Windows Mobile - An application framework for developing composite user interfaces (similar to Silverlight/WPF) on Windows Mobile devices. It contains controls and graphic primitives that support rotation, scaling, animation, behaviours and transitions. Make awesome looking WinMo applications