nginx - A high performance free open source web server powering busiest sites on the Internet.
Apache HTTP Server - Apache httpd has been the most popular web server on the Internet since April 1996
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.
lighttpd - A secure, fast, compliant, and very flexible web-server that has been optimized for high-performance environments
Google Cloud Load Balancing - Google Cloud Load Balancer enables users to scale their applications on Google Compute Engine.