The new Komodo IDE has been released by ActiveState. For those looking
for an all purpose editor/IDE with a ton of features I’ve always found
Komodo a great tool to have. There is intellisense for Ruby and Rails
and a bunch of other languages (Perl, Python, etc.) and a ton more
features.
http://www.activestate.com/products/komodo_ide/
(no I don’t work for ActiveState, just a satisfied customer)