Chef
Configuration management tool which uses a pure-Ruby, domain-specific language (DSL) for writing system configuration recipes. Supports Linux, UNIX, Windows, and AIX as first-class citizens for management.
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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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DeployKit
A generic integration tool built on a Message Queue, to make it easy to communicate events and triggers across various parts parts of the infrastructure. Created to ease the pain of configuring many disparate events in a CI
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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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Monit
An open source utility for managing and monitoring processes, programs, files, directories and filesystems
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Puppet
Puppet is a tool designed to manage the configuration of Unix-like and Microsoft Windows systems declaratively.
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