HtmlSpeed is described as 'Html-Speed is a reverse proxy written in Java' and is an app in the Development category. There are three alternatives to HtmlSpeed for a variety of platforms, including Linux, Mac, Magento Community Edition, Online / Web-based and Windows. The best alternative is nginx, which is both free and Open Source. Other great apps like HtmlSpeed are Varnish (Free, Open Source) and Section (Paid).
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).
Varnish Cache is an open source, state of the art HTTP application accelerator. You can install it on your HTTP server and it makes your application more accessible. The open source community for the fastest web accelerator in the known universe.