Varnish

Varnish is a state-of-the-art, high-performance HTTP accelerator. It uses the advanced features in Linux 2.6, FreeBSD 6/7 and Solaris 10 to achieve its high performance.Some of the features include A modern designVCL - a very flexible configuration languageLoad balancing with health checking of backendsPartial support for ESIURL rewritingGraceful handling of "dead" backendsmore features...