nginx - A high performance free open source web server powering busiest sites on the Internet.
Rackspace Load Balancers - Automatic and on-demand traffic management.
Haproxy - Reliable, High Performance TCP/HTTP Load Balancer
Barracuda Load Balancer ADC - Barracuda Load Balancer offers secure application delivery & load balancing.
SKUDONET - Scale easy and avoid system disruptions with the ADC challengers through high availability, load balancing, security and high performance.
Google Cloud Load Balancing - Google Cloud Load Balancer enables users to scale their applications on Google Compute Engine.