nginx - A high performance free open source web server powering busiest sites on the Internet.
Charles Proxy - HTTP proxy / HTTP monitor / Reverse Proxy
AWS Elastic Load Balancing - Amazon ELB automatically distributes incoming application traffic across multiple Amazon EC2 instances in the cloud.
Wireshark - Wireshark is a network protocol analyzer for Unix and Windows. It lets you capture and interactively browse the traffic running on a computer network.
Azure Traffic Manager - Microsoft Azure Traffic Manager allows you to control the distribution of user traffic for service endpoints in different datacenters.
Postman - The Collaboration Platform for API Development