nginx - A high performance free open source web server powering busiest sites on the Internet.
ProxySQL - ProxySQL: high-performance, GPL licensed MySQL proxy. It supports hundreds of thousands of concurrent connections and can be multiplexed to hundreds of servers.
AWS Elastic Load Balancing - Amazon ELB automatically distributes incoming application traffic across multiple Amazon EC2 instances in the cloud.
Gonarch Tech - MySQL High Availability as a service
Google Cloud Load Balancing - Google Cloud Load Balancer enables users to scale their applications on Google Compute Engine.
Haproxy - Reliable, High Performance TCP/HTTP Load Balancer