Berkshelf
A cookbook source structure manager for Chef, similar to Bundler for Ruby. Each Chef cookbook can be structured as an individual entity and can be pulled into your main Chef workflows.
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Bolt
Bolt is an open source orchestration tool that automates the manual work it takes to maintain your infrastructure. Use Bolt to automate tasks that you perform on an as-needed basis or as part of a greater orchestration workflow. For example, you can use Bolt to patch and update systems, troubleshoot servers, deploy applications, or stop and restart services. Bolt can be installed on your local workstation and connects directly to remote targets with SSH or WinRM, so you are not required to install any agent software.
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Capistrano
The Ruby equivalent of Fabric, Capistrano is a Ruby framework to configure and run deployment or system administration tasks on local or remote machines. It extends the Rake DSL to define tasks, and can group tasks by Roles.
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Deployinator
A simple, rack-based deployment framework
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FastForward
Flexible operating-system event and metric forwarding agent. Receives input and forwards output using plugins.
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Gauntlt
Gauntlt provides hooks to a variety of security tools and puts them within reach of security, dev and ops teams to collaborate to build rugged software. It is built to facilitate testing and communication between groups and create actionable tests that can be hooked into your deploy and testing processes.
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GitLab
GitLab is an open-source, fully featured git web frontend developed using Ruby on Rails. You can host this in your own server, create projects, repositories and teams, manage fine grained access permissions, add wikis, collaborate, raise and merge pull requests, and do much more through the web! (Note: GitLab acquired Gitorious, another open source git management system, in March 2015)
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Librarian-Puppet
Librarian-Puppet is a source structure and dependency manager for Puppet modules, similar to bundler for Ruby. Each Puppet module can be managed as a separate source repository with individual versioning, and can then be pulled into your Puppetfile.
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Mina
A Ruby Rake-like DSL for fast deployment and automation, similar to Capistrano but faster and lesser overhead, since it creates only a single SSH connection for a deploy
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Monit
An open source utility for managing and monitoring processes, programs, files, directories and filesystems
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Opskeleton
Bootstrap a DevOps infrastructure with some opinionated defaults (vagrant, puppet, librarian-puppet, git, etc), standard development guidelines, etc. Makes it very quick to get a DevOps team up and running
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Orc
A model driven orchestration tool for deployment of application clusters
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