Ansible - Radically simple configuration-management, application deployment, task-execution, and multi-node orchestration engine
Google App Engine - A powerful platform to build web and mobile apps that scale automatically.
Jenkins - Jenkins is an open-source continuous integration server with 300+ plugins to support all kinds of software development
Dokku - Docker powered mini-Heroku in around 100 lines of Bash
Puppet Enterprise - Get started with Puppet Enterprise, or upgrade or expand.
Google Cloud Functions - A serverless platform for building event-based microservices.