Jenkins - Jenkins is an open-source continuous integration server with 300+ plugins to support all kinds of software development
Bulma - Bulma is an open source CSS framework based on Flexbox and built with Sass. It's 100% responsive, fully modular, and available for free.
Travis CI - Focus on writing code. Let Travis CI take care of running your tests and deploying your apps.
Phonebot - Make phone calls from within a Slack channel
CircleCI - CircleCI gives web developers powerful Continuous Integration and Deployment with easy setup and maintenance.
Milligram - A minimalist CSS framework