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 connection sharing, bandwidth throttling and realtime graphical and data analysis of proxied traffic. Supports HTTP, FTP and POP3 traffic. [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 web caching, firewall, mail server, access control and activity logging. [Windows]

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

Circuit level proxy with firewall, supports SOCKS, msproxy and http proxy. Port redirection and bandwidth usage control available through add on modules. [Unix]

Offers mail and news server hosting, web caching and activity logging. Trial downloads, online ordering and PDF documentation. [Windows]

Offers connection sharing, content filtering and activity logging. [Java]

Offers application layer FTP service proxying to facilitate use of service through firewalls. Supports various access control options. [Unix, Linux, BSD, Windows]

Configurable IRC proxy. Downloads and product news.