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.
WinDriver USB for Linux automates and simplifies the development of user mode Linux device drivers and hardware control applications for USB peripheral devices. No Linux kernel knowledge or kernel level programming is required. Including powerful tools for hardware diagnostics, automatic driver code generation, and driver debugging, as well as intuitive hardware access API, it provides a complete solution for creating high performance drivers and custom hardware access applications, thereby enabling you to focus on your driver's added-value functionality, instead of on your operating system internals.
SuperWaba is a VM for PDAs. Because of the way it was written, you can use Java to develop programs for it. It supports exceptions, threads, many user interface controls, double and long 64-bit types, grayscale, color, 3D controls, and JNI and Java libraries, among other features. The project has been superseded and replaced with TotalCross.
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.