Squid Proxy - Website Content Acceleration and Distribution. Thousands of web-sites around the Internet use Squid to drastically increase their content delivery. Squid can reduce your server load and improve delivery speeds to clients.
Squid Notes - Take digital handwritten notes for class, work, or fun with Squid on your Android or Chromebook! Markup PDFs, sign documents & more
CCProxy - Want to share Internet connection? Get every computer online through a single Internet connection?
Varnish - High-performance HTTP accelerator
Apache Traffic Server - Fast, scalable and extensible HTTP/S 2 and 1.1 compliant caching proxy server.
nginx - A high performance free open source web server powering busiest sites on the Internet.