* https://loader.io/ - Free load testing tools with limitations.
* http://www.probeapi.com/ - Performance Monitoring API, checks ping, dns etc
* https://blackfire.io - Blackfire is the SaaS-delivered Application Performance Solution. Free Hacker plan.
* http://apimetrics.io/ - Automated API Performance Monitoring, Testing and Analytics. Free Plan- Manually make API calls and Run from their West Coast servers.