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.
Teretere (meaning:travelers/traveling in Tahitian) hosts 2 projects: Cocorails, a Ruby on Rails IDE based on Eclipse http://Cocorails.org and Banana, an Eclipse-based IDE and plugins for web, HTML,CSS, JavaScript & Ajax development http://BananaPeel.org.