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

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 caching, filtering and proxy support for most common protocols. Free downloads and reference manuals. [Windows, OS/2, Unix]

Configurable IRC proxy. Downloads and product news.

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

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

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

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

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