Publicly displays Postfix-policyd's blacklist in real time. Quite useful (in some countries even mandatory) for e-mail hosting to keep your customers informed about blocked smtp hosts and give them the chance to unsubscribe from SPAM-filtering.
CBMS is designed to relieve the burden on dnsbl operators by providing a management framework for their databases and data. CBMS will co-exist with existing management systems or work just as well if not better as the only management system.
WinDSPAM is a statistical spam filter for Windows servers and clients based on Jonathan Zdziarski's DSPAM. Features (will) include intergration with Microsoft Exchange Server 2000/2003 and support for a variety of back-end databases.