diff --git a/README.md b/README.md
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@@ -191,7 +191,37 @@ By the end of the course you'll be able to pass a front end technical screen cov
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+ Sites - Code Playgrounds
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+ JSFiddle - Test your JavaScript, CSS, HTML or CoffeeScript online with JSFiddle code editor.
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+ Codepen - CodePen is an online community for testing and showcasing user-created HTML, CSS and JavaScript code snippets. It functions as an online code editor and open-source learning environment, where developers can create code snippets, called "pens," and test them.
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+ StackBlitz - Code the Future.
+In Your Browser.
+Create, edit & deploy fullstack apps — in just one click.
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+ Sites - Tools
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+ Trello - Whether it’s for work, a side project or even the next family vacation, Trello helps your team stay organized.
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+ Slack - Slack replaces email inside your company.
+Discuss, collaborate, share — work is better without the inbox.
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+ Github - We’re supporting a community where more than 40 million* people learn, share, and work together to build software.
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Sites - Misc