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.
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.
FusionCharts Free is a flash charting component that can be used to render data-driven and animated charts for your Web applications and presentations. It is a cross-browser and cross-platform solution that can be used with ASP.NET, ASP, PHP, JSP, ColdFusion, Ruby on Rails, simple HTML pages, or even PowerPoint presentations to deliver interactive and powerful flash charts. You do not need to know anything about Flash to use FusionCharts. All you need to know is the language in which you're programming.
MiniPauker is a flash card based learning application for mobile devices and handhelds. It is based on the leitner cardfile system and is compatible with Pauker (http://pauker.sf.net, the desktop version of this software). MiniPauker uses a combination of ultra-shortterm, shortterm, and longterm memory. You can use it to learn all the things you never want to forget any more, like vocabulary, capitals, and important dates.