k6 Cloud - Managed load testing service built on top of the popular open-source project k6.
Apache HTTP Server - Apache httpd has been the most popular web server on the Internet since April 1996
OctoPerf - OctoPerf is a SaaS load testing solution, based on JMeter.
Cherokee - High-performance web server
WebLOAD - WebLOAD - The most flexible and cost effective software for enterprise load, stress and performance testing, integrated with DevOps processes. Click for details
Caddy - The HTTP/2 Web Server with Automatic HTTPS