Adodb:   http://adodb.sourceforge.net/
Artichow:  http://www.artichow.org/
Embedded_Cache_Lite: http://fabien.openesub.org/cgi-bin/trac_wrapper/wiki/embedded_cache_lite/
Memcached:  http://phpca.cytherianage.net/memcached/
NuSoap:   http://sourceforge.net/projects/nusoap/
Phpmailer:  http://phpmailer.sourceforge.net/
Phputf8:  http://phputf8.sourceforge.net/
Php_writeexcel:  http://www.bettina-attack.de/jonny/view.php/projects/php_writeexcel/
Smarty:   http://smarty.php.net/
Safehtml:  http://pixel-apes.com/safehtml/
Spyc:   http://spyc.sourceforge.net/
Dbug:   http://dbug.ospinto.com/
Phpmath:   http://www.phpmath.com/
PhpOpenID:   http://www.openidenabled.com/openid/libraries/php/