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.
Google Cloud Load Balancing - Google Cloud Load Balancer enables users to scale their applications on Google Compute Engine.
Citrix NetScaler - Citrix ADC is an industry-leading application delivery controller, L4-7 load balancer, and GSLB that ensures 100% uptime and unmatched security across devices and locations.
Azure Traffic Manager - Microsoft Azure Traffic Manager allows you to control the distribution of user traffic for service endpoints in different datacenters.
Azure Load Balancer - Azure Load Balancer delivers high availability and network performance to the applications.