From http://macromates.com/ :
"TextMate brings Apple's approach to operating systems into the world of text editors. By bridging UNIX underpinnings and GUI, TextMate cherry-picks the best of both worlds to the benefit of expert scripters and novice users alike."
See http://macromates.com/ .
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Mac OSX only. Version 2.0 requires Leopard.
Source code and licensing
Closed source. License (39 euro) is user-specific so can be used on multiple computers by that user. Group and student discounts available. See http://macromates.com/license_policy .
Support for TEI
None in particular.
Interface and documentation in English.
Current version number and date of release
History of versions
How to download or buy
When used with http://www.ditchnet.org/texmlmate/ , makes a fully functional XML editor.