Popular proxy software

• The Squid cache is a popular HTTP proxy server in the UNIX/Linux world.
• The Apache HTTP Server can be configured to act as a proxy server.
• Private Proxy is a software product by PrivacyView Software that connects to an anonymous proxy server to mask a computers IP address.
• Blue Coat's (formerly Cacheflow's) purpose-built SGOS proxies 15 protocols including HTTPS/SSL, has an extensive policy engine and runs on a range of appliances from branch-office to enterprise.
• WinGate is a multi-protocol proxy server and NAT solution that can be used to redirect any kind of traffic on a Microsoft Windows host. It also provides firewall, VPN and mail server functionality. Its WWW proxy supports integrated windows authentication, intercepting proxy, and multi-host reverse-proxying.
• Privoxy is a free, open source web proxy with privacy and ad-blocking features.
• Microsoft Internet Security and Acceleration Server is a product that runs on Windows 2000/2003 servers and combines the functions of both a proxy server and a firewall.
• IceWarp Mail Server includes web server with HTTP proxy which can be configured to screen all traffic with integrated antivirus and/or an external scanner.
• JAP - A local proxy, web anonymizer software connecting to proxy server chains of different organisations
• Tor - A proxy-based anonymizing Internet communication system.
• Proxomitron - User-configurable web proxy used to re-write web pages on the fly. Most noted for blocking ads, but has many other useful features.
• PHProxy is a Web HTTP proxy programmed in PHP to bypass firewalls and other proxy restrictions through a Web interface very similar to the popular CGIProxy.
• The HTTP-Tunnel is a SOCKS and HTTP proxy server and client for Windows.
• SJSWebProxy (SunMicrosystems) is a proxy server for HTTP and HTTPS (CONNECT) requests. It can also serve as a gateway for Ftp and Gopher traffic. It is also free for download.
• Nginx Web and Reverse proxy server, that can act as POP3 proxy server.
• SSH Secure Shell can be configured to proxify a connection, by setting up a SOCKS proxy on the client, and tunneling the traffic through the SSH connection.
• yProxy is a NNTP proxy server that converts yEnc encoded message attachments to UUEncoding, complete with SSL client support.
• PingFu is a proxy server and client for TCP and UDP applications
• WWWOFFLE has been around since the mid-1990s, and was developed for storing online data for offline use.
• Varnish is a high-performance HTTP accelerator with some features comparable to squid.
• Ziproxy is a non-caching proxy for acceleration purposes. It recompresses pictures and optimizes html code, among other features.