There are many alternatives to Squid for Windows if you are looking for a replacement. The best open source Windows alternative is Privoxy. If that doesn't suit you, our users have ranked more than 10 alternatives to Squid and six of them are open source and available for Windows so hopefully you can find a suitable replacement. Other interesting open source Windows alternatives to Squid are Polipo, 3proxy, Proximodo and Privaxy.
Privoxy is a non-caching web proxy with advanced filtering capabilities for enhancing privacy, modifying web page data and HTTP headers, controlling access, and removing ads and other obnoxious Internet junk.
No caching function. Primary usage of squid.
There is no similarity between the two applications. Squid is a caching proxy. Privoxy is not.
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...
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.
Proximodo is a loopback proxy server, seemingly a fork of proxomitron though likely abandonware. Unlike Proxomitron its developer is not existentially challenged. Additionally Proximodo can use Proxomitron filters. Unfortunately it does not support SSL connections.
Privaxy is the next generation tracker and advertisement blocker. It blocks ads and trackers by MITMing HTTP(s) traffic.
TBlock is a content blocker that uses the hosts file (that is present in all operating systems) to block undesired websites.
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It accomplishes the same thing except for one feature: the caching aspect.