nginx - A high performance free open source web server powering busiest sites on the Internet.
Google Cloud Load Balancing - Google Cloud Load Balancer enables users to scale their applications on Google Compute Engine.
AWS Elastic Load Balancing - Amazon ELB automatically distributes incoming application traffic across multiple Amazon EC2 instances in the cloud.
Varnish Plus - Content delivery has never been simpler. Powered by a uniquely flexible caching technology, Varnish Software's content delivery products are indispensable.
Haproxy - Reliable, High Performance TCP/HTTP Load Balancer
Barracuda Load Balancer ADC - Barracuda Load Balancer offers secure application delivery & load balancing.