Apache
www.apache.org
Apache Reverse Proxy Patch
www.engelschall.com/pw/wt/loadbalance/
Alternative products
Software-based solutions:
Squid Internet Object Cache
squid.nlanr.net/Squid/
Netscape Proxy Server
www.netscape.com/proxcy/v3.5
Microsoft Proxy Server
www.microsoft.com/proxy/
Sun Netra Proxy Cache Server
www.sun.com/netra
Hardware-based solutions:
Cisco Systems LocalDirector
www.cisco.com/
Coyote Point Systems Equalizer
www.coyotepoint.com/equalizer.htm