nginx - A high performance free open source web server powering busiest sites on the Internet.
Loader.io - Loader.io is a simple cloud-based load testing service
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
Google Cloud Load Balancing - Google Cloud Load Balancer enables users to scale their applications on Google Compute Engine.
StresStimulus - Load testing tool for websites and mobile that works with hard-to-test applications.