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Programming Environments:
Python
Ruby (contributed by McClain Looney)
Another Ruby library from Jason L Perry
Ruby/Rack (contributed by Arthur Chiu)
JSP Mailhide Tag (contributed by Tamas Magyar)
ColdFusion (contributed by Robin Hilliard)
WebDNA (contributed by Dan Strong)
Applications:
Movable Type (contributed by Josh Carter)
Drupal (contributed by Rob Loach)
Symfony (contributed by Arthur Koziel)
TYPO3 (maintained by Markus Blaschke, contributed by Jens Mittag. See also the example of using the plugin)
NucleusCMS (contributed by Matt)
vBulletin (contributed by Magnus)
Joomla (contributed by Mark Fabrizio)
Joomla Community Builder (contributed by Ayan Debnath)
JSP Mailhide (contributed by Tamas Magyar)
bbPress (contributed by Rhys Wynne)
ExpressionEngine (contributed by Jaspaul Aggarwal)
FlatPress (contributed by Ross Fruen)
PHPKIT (contributed by Norman Huth)
