1)   IM Lock Enterprise 2006
IM Lock Enterprise controls and blocks access to Instant Messaging and peer to peer services. Free trial version available - sets up in less than a minute. Blocks all popular services: MSN Messenger, Yahoo Messenger, ICQ, AIM, Skype,iTunes, and more.
Block P2P, block messenger, block im, internet filtering, block Internet Explorer, block MSN Messenger, block Yahoo Messenger, block chat, block download, block AIM,

 2)   Comvigo Internet Filter and Firewall Pro 2008
Comvigo Internet Filter and Firewall Software - Messenger Blocker, P2P Blocker, Internet Filter, IM Firewall, P2P Firewall, Internet Content Filtering. IM Lock 2008 is a powerful instant message blocker, internet content filter, and Program Firewall.
Internet Filter, P2P Firewall, Block IM, Block P2P, IM Firewall, Messenger Blocker, Content Filtering, Internet Monitor, TCP Firewall, TCP Monitor,

 3)   WFilter 250-User License Pack 5.5
IMFirewall Software develops a proprietary next-generation Internet content filtering and Internet monitor software products.
network monitor, chat monitor, chat monitor software, email monitor software, chat monitor freeware, msn monitor, Block P2P, p2p block, Filter Internet, Web filter,