Jenkins - Jenkins is an open-source continuous integration server with 300+ plugins to support all kinds of software development
Fabricator - Build your UI toolkit for website design
CircleCI - CircleCI gives web developers powerful Continuous Integration and Deployment with easy setup and maintenance.
Carrd - Simple, responsive one-page site creator.
Travis CI - Focus on writing code. Let Travis CI take care of running your tests and deploying your apps.
Flexbox Grid - Grid based on CSS3 flexbox