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javascript ide eclipse plugin web20 web-20 ajax JSEclipse — (still) free and neat javascript editor, distributed as a plugin for Eclipse IDE.
Pros: Code outline is the best I’ve ever seen, syntax checking, support of popular javascript “Web 2.0″ libraries / frameworks like Dojo and Prototype.
Cons: Lacks source formatting and debugging (but its possible to debug [...]

includes javascript js external js+includes javascript+includes You can easily include external JavaScript files directly from JavaScript, just like include() in php etc. No more script src=…, but best of all its fully dynamic. Here’s that nice piece of code: