Glitch - Glitch is the friendly community where everyone builds the web. Simple, powerful interface for creating web apps.
Creative Tim - Awesome Bootstrap freebies and templates to build better websites
Koji - Develop and deploy web apps at a ludicrous speed
CodeMyUI - Handpicked code snippets you can use in your web projects
StdLib - Discover pre-built APIs, compose your own and build apps
thiscodeWorks - Save and share code that works