iNetFusion - use multiple internets at once
nginx - A high performance free open source web server powering busiest sites on the Internet.
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.
Google Cloud Load Balancing - Google Cloud Load Balancer enables users to scale their applications on Google Compute Engine.
KEMP Load Balancer - L4/7 Load Balancer w SSL offload