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.
CircleCI - CircleCI gives web developers powerful Continuous Integration and Deployment with easy setup and maintenance.
Jira - The #1 software development tool used by agile teams. Jira Software is built for every member of your software team to plan, track, and release great software.
Codeship - Codeship is a fast and secure hosted Continuous Delivery platform that scales with your needs.