Bosun is an open-source, MIT licensed, monitoring and alerting system by Stack Exchange. It has an expressive domain specific language for evaluating alerts and creating detailed notifications. It also lets you test your alerts against history for a faster development experience.
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Datadog is a full-stack monitoring service for large-scale cloud environments that aggregates metrics/events from servers, databases, and applications. The SaaS-based data analytics platform helps Dev & Ops teams resolve performance issues, and ensure timely completion of dev/deployment cycles.
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Flexible operating-system event and metric forwarding agent. Receives input and forwards output using plugins.
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KairosDB is a fast distributed scalable time series database written on top of Cassandra. RESTful JSON-based query/results. Includes flot-based visualization.
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Kibana is a modern, beautiful visualization tool that works seamlessly with Logstash and ElasticSearch. It features a no-code setup, realtime analytics, and much more.
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SaaS SSL monitoring and alerting. Snitch audits for revocation, expiration, changes to the certificate, known security vulnerabilities, and best practices. Snitch worries about your SSL/TLS certificate so you don't have to
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