Varnish is described as 'Cache is an open source, state of the art HTTP application accelerator'. There are more than 10 alternatives to Varnish for a variety of platforms, including Linux, Mac, Windows, BSD and Self-Hosted solutions. The best alternative is nginx, which is both free and Open Source. Other great apps like Varnish are Squid (Free, Open Source), memcached (Free, Open Source), TinyProxy (Free, Open Source) and Apache Ignite (Free, Open Source).
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.
Reproxy is a simple edge HTTP(s) server / reverse proxy supporting various providers (docker, static, file). One or more providers supply information about the requested server, requested url, destination URL, and health check url.
Html-Speed is a reverse proxy written in Java. It is used for accelerating performance of websites by improving page load speed and reducing load on webservers. This is achieved by applying unique front-end optimizations.