TextMate is a popular programmers-editor for OS X. Homepage: ​http://macromates.com/

One of the most interesting feature is the ability to define "Snippets", abbreviations which can be expanded into larger blocks of text.

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Remember: winners use Vim.

ubernostrum sez: I can attest that in the office where Django is developed, TextMate users are in abundance. Gosh, aren't wikis fun?