Ansible
A versatile orchestration engine that can automate systems and apps. Instead of a custom scripting language or code, it is very simple and shell based. It is also agent-less, so you can just start using it right away and get things done
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Batou
Batou makes it easy to perform automated deployments. It combines Fabric's simplicty and SSH automation, with Puppet's declarative syntax and idempotence
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Brood
A Deployment framework written in PHP. Can deploy to multiple servers using Gearman.
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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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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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