Jukebox is a collection of reusable components that allow you to create a flexible server-side and middleware framework. It features semaphores and services (not quite your usual set), a Finite State Machine implementation based on Generics, a Datastream framework (data producers, consumers and loggers), and a JDK 1.6 compliant JMX framework based on Annotations.
ServoMaster provides hardware independent abstractions to servos and servo controllers. It has implementations for several servo controller families, including Phidget, Pololu, Parallax, and SSC. It has support for servo and controller metadata, introspection, and capabilities discovery.
SCOP is a library for writing distributed applications. The functionality includes message-passing, events, and RPCs. It is primarily aimed at C++ programs on Linux, or Java anywhere. Much simpler than CORBA, it is easy to learn, general-purpose, fairly fast, thoroughly documented, complete, and free.
WebCharts 3D allows you to deliver general purpose and specialized 2- and 3-dimensional charts as applets or interactive server-generated images (PNG, GIF, JPEG, SWF, SVG, PDF, TIFF, VML, CANVAS, and WBMP) to Web browsers and mobile devices, or embed charts into stand-alone Swing/SWT applications. It includes a WYSIWYG (What You See Is What You Get) designer that can be easily incorporated into your own applications to provide your end-users with chart editing capabilities. Full JSF and Sun Creator support and a free Eclipse Designer plugin are included.