AWS Elastic Load Balancing - Amazon ELB automatically distributes incoming application traffic across multiple Amazon EC2 instances in the cloud.
SKUDONET - Scale easy and avoid system disruptions with the ADC challengers through high availability, load balancing, security and high performance.
KEMP Load Balancer - L4/7 Load Balancer w SSL offload
Haproxy - Reliable, High Performance TCP/HTTP Load Balancer
Avi Vantage Load Balancer - Avi Vantage is a suite of multi-cloud application services that, among others, consist of a Software Load balancer to help provide you with a scalable, quick, and secure application experience.
nginx - A high performance free open source web server powering busiest sites on the Internet.