ConDep
ConDep is a open source infrastructure configuration and deployment DSL (Domain Specific Language) specifically targeted to (but not limited to) the Windows Server platform. If your familiar with tools like Chef and Puppet, ConDep does very much the same, but with native support for Windows.
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ConfigCat
ConfigCat is a feature flags as a service. It gives you a web based dashboard to manage your feature flags + SDKs to integrate those feature flags into your applications. ConfigCat enables you to use the same feature flags in your mobile apps, websites and server-side applications. It offers all features for free. You get an enterprise-ready SLA with the pricing plans.
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Gerrit
A Web based code review and project management system for Git projects
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GoCD
Go is a continuous delivery and release management tool, built from the ground up with pipelines in mind, and makes it easy to model complex build and deploy workflows
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Hubot
Hubot is a chat bot that can be configured to do a variety of tasks. Apart from usual CI stuff like deploying, it can be interestingly configured to do different workflows like posting images, translating languages and integrating with Google Maps, and being a bot, it can be configured to ask questions like what is the current deployed version, etc.
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Hudson
The original lightweight CI tool written in Java. Initially part of Sun, then acquired by Oracle, and now maintained to the Eclipse Foundation
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jclouds
A Java Library for controlling cloud resources, with various plugins for many popular cloud providers.
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Jenkins
Jenkins is an open source, lightweight CI tool written in Java, with high extensibility and a fast release cycle. It was forked from Hudson after Oracle acquired it, and has since added significantly more features than the original
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Pallet
A tool to provision and maintain servers across various cloud platforms as well as virtual machine platforms, without any dependencies. Provides cloud and operating system independence.
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Spinnaker
Spinnaker is an open source, multi-cloud continuous delivery platform for releasing software changes with high velocity and confidence. It provides two core sets of features: cluster management and deployment management.
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