Aptana Studio recently declined a payment offer and is now fully open. It has additional support for subversion, CVS, Git, and several javascript libraries (jquery, ext, prototype, etc.), as well as PHP, python, and Rails.
It is worth noting that if you tried Aptana in the past and did not like their own php editor, they now abandoned it in favor of PDT.
I used Aptana for a while to develop a large project, and I haven't found anything yet.
Jonathan hanson
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