HTML Purifier : HTML Purifier is a standards-compliant HTML filter library written in PHP. HTML Purifier will not only remove all malicious code (better known as XSS)...
HTML_QuickForm2 : This PHP package provides methods to create, validate and render HTML forms.
PHP unified diff patcher : A powerful class which allows to create and merge unified diff patches into any file. Fully written in PHP, uses the GNU standard unified diff format ...
TCPDF : TCPDF is a FLOSS PHP class for generating PDF documents.
pChart : pChart is a PHP class oriented framework designed to create aliased charts.
WebSockets for PHP
Ratchet is a loosely coupled PHP library providing developers with tools to create real time, bi-directional applications between clients and servers over WebSockets. This is not your Grandfather's Internet.