Groovy Monkey is a Utility for Eclipse that enables you to create scripts in Groovy, Beanshell, Python or Ruby to run directly in Eclipse. This tool can be used to Eclipse API exploration, automation scripts, and rapid plugin prototyping.
Open-jACOB is a rapid application development tool base on Eclipse that enables the development of RichInternetApplications that are based entirely on Java. Open-jACOB application can be deployed as a stand alone app's in a Web container like Tomcat.
This is a PLaSM Plugin for Eclipse. PLaSM is a geometric extension of FL, a functional programming language by Backus' group at IBM research, that allows for rapid development of curves, surfaces and solids.