Aladdin Knowledge Systems
- eSafe gateway based content security providing protection against malicious software and spam/url filtering. [Windows/Linux] Also offer USB smart card for token authentication and hardware dongles for software copy protection purposes.
- http://www.aladdin.com/

PServer
- Offers connection sharing, content filtering and activity logging. [Java]
- http://mysite.verizon.net/gjcullen/PRXYdoc.htm

Qbik
- Wingate offers connection sharing, caching, access control, usage monitoring and firewall services. Content filtering, anti-virus and VPN options available as extras. [Windows]
- http://www.wingate.com/

WWWOFFLE
- Open source caching Web proxy for offline use and low-bandwidth connections. Supports ad blocking and security filtering.
- http://www.gedanken.demon.co.uk/wwwoffle/

JanaServer
- Offers connection sharing, monitoring and user level access control. Also offers http, email, ftp and news server functionality. [Windows]
- http://www.janaserver.de/en/

TcpIQ
- Offers connection sharing, bandwidth throttling and realtime graphical and data analysis of proxied traffic. Supports HTTP, FTP and POP3 traffic. [Windows]
- http://www.tcpiq.com/

Dante
- Circuit level proxy with firewall, supports SOCKS, msproxy and http proxy. Port redirection and bandwidth usage control available through add on modules. [Unix]
- http://www.inet.no/dante/

Philtron
- Filtering HTTP proxy that rewrites the HTML of the web pages that pass through it; removing unwanted/hostile content from the pages and providing enhanced user anonymity. [Written in PHP, platform independent]
- http://philtron.sourceforge.net/

ftp.proxy
- Offers application layer FTP service proxying to facilitate use of service through firewalls. Supports various access control options. [Unix, Linux, BSD, Windows]
- http://www.ftpproxy.org

Netscape Proxy Server
- Offers web caching, content filtering, access control and activity reporting. [Unix, Windows]
- http://wp.netscape.com/proxy/v3.5/datasheet/

Linkbyte Software, Inc.
- ComTun Pro, offers connection sharing, firewall, spam filtering and caching. [Windows]
- http://www.linkbyte.com/

ezbounce
- Configurable IRC proxy. Downloads and product news.
- http://druglord.freelsd.org/ezbounce/

DeleGate
- Offers caching, filtering and proxy support for most common protocols. Free downloads and reference manuals. [Windows, OS/2, Unix]
- http://www.delegate.org/delegate/

Oops! proxy server
- Open source web and ftp caching proxy. [Unix, Linux, FreeBSD]
- http://zipper.paco.net/~igor/oops.eng/

Ositis Software, Inc.
- Winproxy software offers web caching, firewall, antivirus, site filtering, spam protection and activity monitoring. [Windows]
- http://www.ositis.com/

Tircproxy
- IRC proxy, access control available via standard Unix hosts file configuration. [Linux]
- http://bre.klaki.net/programs/tircproxy/

Surfer Protection Program
- HTTP proxy that enhances user privacy by deleting (or faking) eight data elements, including the Cookie field and Referrer fields, from web browser responses. [Windows]
- http://www.surferprotectionprogram.com/

Tinyproxy
- HTTP proxy with low system resource requirements. Offers http header blocking. [Unix]
- http://tinyproxy.sourceforge.net/

Apple.com: RTSP/RTP Proxy
- Offers client machines within a protected network access to streaming servers outside the firewall. [Mac OS]
- http://developer.apple.com/quicktime/quicktimeintro/tools/

Proxy+
- Offers web caching, firewall, mail server, access control and activity logging. [Windows]
- http://www.proxyplus.cz/

602 LAN SUITE
- Offers mail server, spam filtering, antivirus, web caching, access control, firewall and activity logging. [Windows]
- http://www.software602.com/products/ls/

NetProxy
- Offers web caching, site filtering, firewall, activity logging and access control. [Windows]
- http://www.grok.co.uk/netproxy/

micro_proxy
- HTTP/HTTPS proxy that runs from inetd, and uses less than 1kb of diskspace. [Unix]
- http://www.acme.com/software/micro_proxy/

Vicomsoft Ltd
- InterGate software offers web caching, stateful inspection firewall, content filtering and network management services. Anti spam module also available. [Mac OS, Windows]
- http://www.vicomsoft.com/

EServ
- Offers mail and news server hosting, web caching and activity logging. Trial downloads, online ordering and PDF documentation. [Windows]
- http://www.eserv.ru/eserv/

iMimic Networking, Inc.
- Offers web caching and multimedia streaming caching functionality. Also offer content filtering software. [Solaris, Linux, FreeBSD]
- http://www.imimic.com/