Assimilation System Management Suite
The Assimilation Suite discovers systems, services, network connections, configuration and dependencies, IP and MAC addresses. This all goes into a continually updated graph-based configuration management database (CMDB). This is then compared and scored against best practices, services and servers are monitored - all with near-zero configuration - in a way that scales to hundreds of thousands of servers. It also provides visualization tools, APIs for sending alerts to humans and other systems, and a variety of canned reports (queries) to aid in securing and managing systems, hooking into ChatOps, and creating plans for triaging your security issues
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Buildbot
Buildbot is an open-source framework for automating software build, test, and release processes. It differs from other CI tools in that it is more of a betteries included Framework, rather than a tool, and can hence be grown to meet your own needs. One of the reasons it is used in many high profile open source projects like Chromium, Firefox, Webkit, Python, etc.
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Cabot
Cabot is an open source, self hosted infrastructure monitoring tool. It can monitor your services and send telephone, SMS, email or chat alerts to your team whenever anything goes down, all without writing a single line of code.
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