Brooklyn
A Java based deployment tool, focused on both deployment as well as post-deploy lifecycle management. It is aware of network topologies, integrates with many cloud and PaaS APIs, and is designed to handle the entire roll-out
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jclouds
A Java Library for controlling cloud resources, with various plugins for many popular cloud providers.
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jmxtrans
Plugs Java VM statistics via JMX to various backend monitoring tools
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KairosDB
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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Logstash
A modern tool for managing events and logs, with an ElasticSearch backend which allows a high degree of searching and filtering. It includes a shipper in remote systems, indexer in the aggregator machine, and a Web UI.
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Metrics
Captures JVM and application-level metrics for Java
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Rex
A agent-less server orchestration tool built on Perl
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Rundeck
Turns your operational procedures into self-service portal. Define common operational tasks in the Rundeck web portal, and safely hand it over to the rest of the team so that they can perform these tasks without you being around.
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Sentry
Automate error tracking to find and fix issues before your users even experience a crash. Sentry is open-source, real-time, and loved by 100,000 developers around the world.
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Zipkin
A distributed request tracking system, useful for micro-service and distributed architectures written in Scala
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