Untangle is a privately held company that provides an open source network gateway for small business. Untangle provides multiple gateway applications installed at the edge of a network. These applications include Anti-spam, Web Content Filtering, Antivirus, Anti-phishing, Anti-spyware, Intrusion prevention, Firewall, OpenVPN, SSL VPN, Router, Protocol Control, Attack Blocker, Reporting, Policy Manager, and Kaspersky Virus Blocker  on the Untangle Gateway Platform.
Untangle was founded in 2003 as Metavize, Inc. by John Irwin and Dirk Morris. Metavize officially launched in 2005 at Demo@15!. In 2006, Metavize raised a $10.5M series-A venture funding round from CMEA Ventures and Rustic Canyon Partners, named Bob Walters as CEO, and renamed to Untangle, Inc. In 2007, Untangle released the Untangle Gateway Platform as open source under the GPLv2 license , and surpassed 100,000 users in 2,000 organizations.  In 2009, Untangle claimed over 1 million protected users. 
http://news.cnet.com/Security-start-up-Untangle-goes-open-source/2100-7344_3-6193225.html http://www.darkreading.com/showArticle.jhtml?doc_id=141239 http://www.prlog.org/10250712-untangle-surpasses-1-million-protected-users-mark.html