added Opsmatic as suggested by @iweizman

README.md

@@ -274,6 +274,7 @@ A curated list of amazingly awesome open source sysadmin resources inspired by [
 * [Nagios](http://www.nagios.org/) - Computer system, network and infrastructure monitoring software application.
 * [Observium](http://www.observium.org/) - SNMP monitoring for servers and networking devices. Runs on linux.
 * [OMD](http://omdistro.org/) - The Open Monitoring Distribution.
+* [Opsmatic](https://opsmatic.com/) - Configuration monitoring software for your infrastructure with automatic drift detection.
 * [Opsview](http://www.opsview.com/solutions/core) - Based on Nagios 4, Opsview Core is ideal for small IT and test environments.
 * [Riemann](http://riemann.io/) - Flexible and fast events processor allowing complex events/metrics analysis.
 * [Sensu](http://sensuapp.org/) - Open source monitoring framework.