CircleCI - CircleCI gives web developers powerful Continuous Integration and Deployment with easy setup and maintenance.
Documize - Enterprise-grade wiki and knowledge management platform
Jenkins - Jenkins is an open-source continuous integration server with 300+ plugins to support all kinds of software development
HackMD - Fast and flexible, real-time collaborative markdown, inspired by Hackpad.
Bitrise - Tens of thousands of agencies, startups and enterprise companies with mobile apps - including Runkeeper, Grindr, Duolingo and more - use Bitrise to automate their way to increased productivity & speed
ReadTheDocs - Spend your time on writing high quality documentation, not on the tools to make your documentation work.