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).
nginx [engine x] is a HTTP and reverse proxy server, as well as a mail proxy server written by Igor Sysoev. It has been running for more than five years on many heavily loaded Russian sites including Rambler (RamblerMedia.com).
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.
Apache Ignite In-Memory Data Fabric is a high-performance, integrated and distributed in-memory platform for computing and transacting on large-scale data sets in real-time, orders of magnitude faster than possible with traditional disk-based or flash technologies.
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Apache Ignite vs Varnish opinions
pros, cons and recent comments
Ignite is a distributed object cache (like Gemfire, Coherence, or Hazelcast). It's not an HTTP proxy or caching proxy.
Formerly a commercial product, Yahoo! donated it to the Apache Foundation, and it is now an Apache TLP. Caching Improve your response time, while reducing server load and bandwidth needs by caching and reusing frequently-requested web pages, images, and web service calls.
WinGate Proxy Server is a highly capable integrated Proxy server, firewall and email server designed for access control, security and communications needs. What you do get is all the features of Standard license for 3 concurrent users.