Peter Graves just released Armed Bear J version 0.18.0, a text editor with extensive programming language support implemented in Java. J is the first "properweight" (not too light like Notepad, not too heavy like JEdit) Java-based text editor I've ever used, even though I've only fiddled with it in this and previous versions. 0.18.0 sports impressive Common Lisp support, including HyperSpec integration. There are hints that J might one-day be extensible in a Lisp too, namely, Armed Bear Lisp.