The best open source alternative to WinGate is Squid. If that doesn't suit you, our users have ranked more than 10 alternatives to WinGate and nine of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to WinGate are Polipo, TinyProxy, 3proxy and Varnish.
Squid is a caching proxy for the Web supporting HTTP, HTTPS, FTP, and more. It reduces bandwidth and improves response times by caching and reusing frequently-requested web pages. Squid has extensive access controls and makes a great server accelerator.
A small and fast caching web proxy (a web cache, an HTTP proxy, a proxy server). Polipo can be used in place of ad-filtering, privacy-enhancing proxies such as Junkbuster, Privoxy or WWWOFFLE. As Polipo has much more refined HTTP support, it doesnt impose the speed tax usually...
Tinyproxy is a light-weight HTTP/HTTPS proxy daemon for POSIX operating systems. It is free software, and supports transparent and reverse proxying.
3Proxy tiny free proxy server is really tiny cross-platform (Win32/Win64&Unix) freeware proxy servers set. It includes HTTP proxy with HTTPS and FTP support, SOCKSv4/SOCKSv4.5/SOCKSv5 proxy (socks/socks.exe), POP3 proxy, SMTP proxy, AIM/ICQ proxy (icqpr/icqpr.
Varnish Cache is an open source, state of the art HTTP application accelerator.
WinGate is a ProxyServer, Varnish is a pass-through cache
ARTICA Proxy is an enterprise grade security appliance : web filtering (w/o SSL decryption), DNS Filtering, bandwith optimisation, easy ACL management, users authentication on LDAP or Active Directory (NTLM/Kerberos), deployment tools (such as proxy.
CacheGuard Gateway is a free and open-source Unified Threat Management (UTM) solution, a Web Application Firewall (WAF), and a Quality of Service (QoS) platform designed to optimize WAN traffic. To obtain a CacheGuard Gateway appliance, download CacheGuard-OS and install it on...
Formerly a commercial product, Yahoo! donated it to the Apache Foundation, and it is now an Apache TLP.
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Squid is not a SOCKS proxy server