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Front-end
- GitBook began in mid-2014 as an open-source tool for developers to build documentation. Today we empower teams of all sizes to share knowledge and build great internal & external docs.
- CodePen is a social development environment for front-end designers and developers. Build and deploy a website, show off your work, build test cases to learn and debug, and find inspiration. CodePen is a playground for the front end side of the web. It's all about inspiration, education, and sharing.