Jenkins - Jenkins is an open-source continuous integration server with 300+ plugins to support all kinds of software development
Bots UI Kit - Fully customizable Sketch UI Kit for Messenger Platform
CircleCI - CircleCI gives web developers powerful Continuous Integration and Deployment with easy setup and maintenance.
Now UI Kit - A beautiful Bootstrap 4 UI kit. Yours free.
Travis CI - Focus on writing code. Let Travis CI take care of running your tests and deploying your apps.
Landing UI Kit - Handcrafted UI components for landing pages