iNetFusion - use multiple internets at once
AWS Elastic Load Balancing - Amazon ELB automatically distributes incoming application traffic across multiple Amazon EC2 instances in the cloud.
KEMP Load Balancer - L4/7 Load Balancer w SSL offload
Haproxy - Reliable, High Performance TCP/HTTP Load Balancer
nginx - A high performance free open source web server powering busiest sites on the Internet.
HAProxy Enterprise Edition - Load Balancers