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.
Azure Traffic Manager - Microsoft Azure Traffic Manager allows you to control the distribution of user traffic for service endpoints in different datacenters.
Haproxy - Reliable, High Performance TCP/HTTP Load Balancer
Google Cloud Load Balancing - Google Cloud Load Balancer enables users to scale their applications on Google Compute Engine.
Azure Application Gateway - Manage traffic to your web applications using Azure Application Gateway, a load balancer that features a web application firewall and intelligent layer 7 routing.