I don't want to be too confident, but as far as I know, the editor with
the most features is jEdit with its LilyPondTool plugin. :-) I don't
what the definition of an IDE is, but the most complete one is
LilyPondTool for sure.
I feel the automatic completion and document wizard a must for beginners.
However you get an indexed LilyPond documentation, syntax coloring
out-of-the-box, code folding, brace matching, instant help on markup
commands, some simple error checking (like unclosed braces), and much
more: hyphenation, midi player, tweaking wizard, repeats etc.
Convince yourself with http://web.interware.hu/fodber/lilytut
Bert
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