eSafe gateway based content security providing protection against malicious software and spam/url filtering. [Windows and GNU/Linux] Also offers USB smart cards for token authentication and hardware dongles for software copy protection purposes.

Offers client machines within a protected network access to streaming servers outside the firewall. [Mac OS]

Offers a NAT firewall, transparent proxy, secure email server, access control policies, user monitoring, VPN, and reverse proxy. Content filtering and anti-virus plug-ins available. [Windows]

Offers mail server, spam filtering, antivirus, web caching, access control, firewall and activity logging. [Windows]

Open source web proxy designed to help Internet users affected by Internet censorship securely bypass content-filtering systems. Its recommended use is amongst private, trusted relationships rather than as an open public proxy.

Offers connection sharing, monitoring and user level access control. Also offers http, email, ftp and news server functionality. [Windows]

Forwarding, non-caching, HTTP proxy targeted for traffic optimization. This open source application works by compressing pictures and other data.[UNIX]

Open source, small and fast caching web proxy for Windows and UNIX systems. Includes detailed documentation.

Open source caching Web proxy for offline use and low-bandwidth connections. Supports ad blocking and security filtering.

Offers connection sharing, bandwidth throttling and realtime graphical and data analysis of proxied traffic. Supports HTTP, FTP and POP3 traffic. [Windows]