Here are some sites with useful developer tools & reference material. Some of them are simple links to the original source, while some are also elaborated on below for quick & helpful reference.
- Cheat Sheets -- Source
- HEAD: A list of everything that could go in the head of your document -- Source
- Shields.io: We serve fast and scalable informational images as badges for GitHub, Travis CI, Jenkins, WordPress and many more services. Use them to track the state of your projects, or for promotional purposes. -- Source
- Storybook: The UI Development Environment. -- Source
- Branching & Release Strategy -- Source
- Probot: GitHub Apps to automate and improve your workflow. Use pre-built apps to extend GitHub, and easily build and share your own. -- [Source](https://probot.gith