LogicAnalyzer is a framework as well as an application to operate a PC based logic analyzer. It's built using the Eclipse RCP and designed with extensibiliy in mind. Integrating new devices or creating completely new functionality is easy.
JCGrid is an easy-to-use tools for real-world grid-computing. It requires only to install Java Runtime and you can easy split your cpu-intensive task among several Workstations/PC/Mac/etc. It includes support for POVRay and MandelGrid as usage examples.