Buildstep
Buildstep uses Docker and small buildpack scripts to build applications like Heroku. It was used by Dokku to create a 100-line Heroku clone. There are many open source Buildpack scripts for various languages like Java, Ruby, Erlang, PHP, etc.
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Djangy
An open source cloud hosting service for Python/Django web applications. Its like an open source Heroku for python/django
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Fog
The Ruby Cloud API library. Provides a Ruby API for interacting and managing many cloud providers, such as spinning up new instances, terminating old ones, attaching storage, etc. Currently supports more than 20 providers, including EC2, Rackspace, Brightbox, etc.
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Foreman
A complete lifecycle management tool for servers, both self-hosted and in the cloud. It allows you to create and manage instances, build and deploy images, view and audit hosts, and much more! It works with Puppet or Chef, and has multiple interaction facilities like a web frontend, CLI and a RESTful API.
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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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jclouds
A Java Library for controlling cloud resources, with various plugins for many popular cloud providers.
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ĵeto
Streamline your web projects from development from production. Jeto is a web interface for several ReST APIs (nginx-api, vagrant-worker and htpasswd-api). With Ĵeto you add and manage (start/stop/provision) vagrant projects on the fly via a nice and easy to use web interface.
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Apache Libcloud
Python library for interacting with many of the popular cloud service providers using a unified API.
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Pulumi
Create, deploy, and manage Cloud Native infrastructure, as real code. A single toolset for infrastructure, managed services, containers, and serverless environments on any cloud infrastructure. You get all the benefits of real programming languages; IDEs, abstractions and reuse thanks to functions, classes, and packages, debugging, testability, and more
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Sovereign
A set of Ansible playbooks to configure and maintain your own personal cloud, including email, calendars, file storage, vpn, irc, etc. A nice collection of utilities as well as a good showcase of Ansible's features
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SSH KeyBox
An open-source jump box solution with auditing capabilities
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StackStorm
A platform for event-driven automation. StackStorm allows you to integrate and automate across services and tools. It ties together your existing infrastructure and application environment so you can more easily automate that environment -- with a particular focus on taking actions in response to events.
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testssl.sh
A command-line tool which checks a server's service on any port for the support of TLS/SSL ciphers, protocols as well as some cryptographic flaws. It's designed to provide clear output for your "is this good or bad" decision.
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Vaurien
A Chaos Monkey for TCP, it randomly disconnects or stalls TCP connections in your application to test application tolerance and high availability. Makes sure you correctly handle these unexpected events
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