Frink is a calculating tool and programming language designed to help you in the real world. It tracks units of measurement throughout all calculations and ensures that answers are correct. It converts between systems of measurement, and has a huge library of physical data. It is both a simple calculator for quick calculations and a full-fledged programming language for large tasks. It draws high-quality graphics, handles conversions between time zones, currencies, and historical values of the U.S. dollar and the British pound, translates between several languages, does date/time math, and more.
WabbelLab is a game were one has to roll a ball through a maze without hitting one of the holes. The nice thing about this game is that it is not controlled with the keys but with help of the camera. The camera is used to determine the tilt of the phone - and the ball will always roll into the direction in which the phone has been tilted. It was developed for the Nokia 3650 but seems to work also on other phones with similar hardware like the 7650.
Where Am I is an application designed to be useful when traveling to a new place. It helps provide up-to-date maps and access to other people's opinions about the places you might visit. It also lets you record and share your experiences with both other mobile phone users and your friends back home.
WmConsole is a console server for Windows Mobile devices which listen over BlueTooth RFCOMM channels. It allows the user to interact with the device using a commandline interface from a Linux or Windows workstation. You need the QTTY Linux/Windows client to access a WmConsole server.
db4o is an object database for Java and all .NET environments. Its features include ACID transactions, automatic class schema recognition, query-by-example, a S.O.D.A. object querying API, native queries, LINQ support on .NET, callback methods, memory files, cascade-on-delete, multi-threaded access, and Java Webstart and servlet support.