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In computer networks, a proxy server a firewall.
Nginx Web and Reverse proxy server, that can act as POP3 proxy server.
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.
Polipo is a caching web proxy with privacy and ad-blocking features.
PHProxy Live A great integration of the popular PHProxy put to use.
Proxomitron - User-configurable web proxy used to re-write web pages, emails, instant messenger messages, and other network transmissions on the fly.
The Apache HTTP Server can be configured to act as a proxy server.
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.
JAP - A local proxy, web anonymizer software connecting to proxy server chains of different organisations
FreeProxy - A popular caching proxy freely available for Windows servers for HTTP, SOCKs, FTP, NNTP proxying.
IceWarp Mail Server includes web server with HTTP proxy which can be configured to automatically test e-mail senders for open proxies, using software such as Michael Tokarev's proxycheck.
Groups of IRC and electronic mail operators run DNSBLs publishing lists of the IP addresses of known open proxies, such as AHBL, CBL, NJABL, and SORBS.
The ethics of automatically testing clients for open proxies are controversial. Some experts, such as Vernon Schryver, consider such testing to be equivalent to an attacker
