Varnish is not available for Windows but there are some alternatives that runs on Windows with similar functionality. The best Windows alternative is Squid, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 10 alternatives to Varnish and eight of them are available for Windows so hopefully you can find a suitable replacement. Other interesting Windows alternatives to Varnish are CivetWeb, WinGate, freenginx and Apache Ignite.
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.
CivetWeb is an easy to use, powerful, C/C++ embeddable web server with optional CGI, SSL and Lua support.
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.
high-performance, integrated and distributed in-memory platform for computing and transacting on large-scale data sets in real-time.
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.
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Ignite is a distributed object cache (like Gemfire, Coherence, or Hazelcast). It's not an HTTP proxy or caching proxy.