Polipo - A small and fast caching web proxy (a web cache, an HTTP proxy, a proxy server).
NextDNS - Block ads, trackers and malicious websites on all your devices.
Privoxy - Privoxy helps users to protect their privacy.
Quad9 - Quad9 is a free, recursive, anycast DNS platform that provides end users robust security protections, high-performance, and privacy.
ExaProxy - ExaProxy is a a high-performance non-caching proxy.
OpenDNS - OpenDNS provides faster and safer Internet access for your home or Business.