nginx - A high performance free open source web server powering busiest sites on the Internet.
OctoPerf - OctoPerf is a SaaS load testing solution, based on JMeter.
AWS Elastic Load Balancing - Amazon ELB automatically distributes incoming application traffic across multiple Amazon EC2 instances in the cloud.
WebLOAD - WebLOAD - The most flexible and cost effective software for enterprise load, stress and performance testing, integrated with DevOps processes. Click for details
Azure Traffic Manager - Microsoft Azure Traffic Manager allows you to control the distribution of user traffic for service endpoints in different datacenters.
StresStimulus - Load testing tool for websites and mobile that works with hard-to-test applications.