Ansible - Radically simple configuration-management, application deployment, task-execution, and multi-node orchestration engine
Nifty - Manage projects, work, and communications in one place.
Jenkins - Jenkins is an open-source continuous integration server with 300+ plugins to support all kinds of software development
Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.
Puppet Enterprise - Get started with Puppet Enterprise, or upgrade or expand.
Asana - Asana project management is an effort to re-imagine how we work together, through modern productivity software. Fast and versatile, Asana helps individuals and groups get more done.