libsieve-php is a library to manage and modify sieve (RFC5228) scripts. It contains a parser for the sieve language (including extensions) and [not yet] a client for the managesieve protocol. It is written entirely in PHP 5.
SmartSieve is a web based graphical user interface for creating and managing sieve scripts for mail filtering and vacation messaging on a cyrus imap mail server. Written in PHP, SmartSieve is easy to configure and use.
SpamList is a simple system to maintain your internal whitelists and blacklists for spam control. Includes PHPscripts to manage the master list and shell scripts to distribute to one or more servers.