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.
Microsoft Azure Traffic Manager - Microsoft Azure Traffic Manager is a great solution that enables you to route incoming traffic for high availability and performance.
Haproxy - Reliable, High Performance TCP/HTTP Load Balancer
KEMP Load Balancer - L4/7 Load Balancer w SSL offload
Netflix Eureka - Eureka is a REST-based AWS service registry for resilient mid-tier load balancing and failover.