Komodo(!)

[David C Ullrich]

Probably this isn't news to anyone but me, but just in case:

Last I heard Komodo was a very highly regarded IDE that unfortunately
cost money. Yesterday I discovered that they now have an editor
available for free.

Doesn't contain all the features of the IDE, but just having glanced
at it it seems to contain more than I'll ever use. What I really
like about it is that one can write Komodo scripts in Python
(using an extensive API allowing various manipulations of the
current document).