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Free and Open Source Load-Balancing Software and Projects

Apache: mod_athena
http://code.google.com/p/ath/

Apache: mod_proxy_balancer
http://httpd.apache.org/docs/2.1/mod/mod_proxy_balancer.html

Balance
https://www.inlab.net/balance

Core Balance
http://core-balance.sourceforge.net/

Crossroads
http://crossroads.e-tunity.com/

Distributor
http://distributor.sourceforge.net/

Eddie (written in Erlang)
http://eddie.sourceforge.net/

Enhydra Director
http://forge.ow2.org/projects/director

HAProxy
http://haproxy.1wt.eu/

Linux Network Load Balancing
http://lnlb.sourceforge.net/

Linux Virtual Server (LVS)
http://www.linuxvirtualserver.org

Load Balancer Project
http://www.jmcresearch.com/projects/loadbalancer/

Neutrino
http://neutrinoslb.io/

nginx
http://nginx.org

Octopus Load Balancer
http://sourceforge.net/projects/octopuslb/

OpenLoBa
http://openloba.sourceforge.net/

Pen
http://siag.nu/pen

Perlbal (implemented in Perl)
http://danga.com/perlbal/

Pound
http://www.apsis.ch/pound/

Riverdrums Load Balancer
http://sourceforge.net/projects/rlb/

varnish
http://www.varnish-cache.org/

XLB HTTP Load Balancer
http://sourceforge.net/projects/xlb/

Zevenet Load Balancer (former Zen Load Balancer)
http://www.zevenet.com