* 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
* https://www.opsdash.com/ - Self-hoster server, clusters and services monitoring, free for 5 servers and 5 services
* https://www.opsdash.com/ - Self-hoster server, clusters and services monitoring, free for 5 servers and 5 services