Existing XSS filters

Here are the existing stand-alone open-source XSS filters that I know of:

kses (me, Ulf Harnhammar)
PHP
http://sourceforge.net/projects/kses

XSS filter for PHP4 - the filter from Squirrelmail (Konstantin Riabitsev)
PHP
http://www.mricon.com/html/phpfilter.html

HTML::StripScripts and related CPAN modules (Nick Cleaton)
Perl
http://search.cpan.org/author/NCLEATON/HTML-StripScripts-0.01/StripScripts.pm

There are also a lot of people who's written some kind of XSS filter specifically for their project. Some of them are better than others.

Please reply if you know about any other stand-alone, open-source filters.

// Ulf Harnhammar

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