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 * [WikiDiff](https://wikidiff.com/) - display difference between two terms, using wikipedia definition. Useful when answering online tests
 * [BubuAnabelas/awesome-markdown](https://github.com/BubuAnabelas/awesome-markdown) - A curated list of delightful Markdown stuff.
 * [Markdeep](http://casual-effects.com/markdeep/) -  a free technology for writing plain text documents that will look good in any web browser, whether local or remote. It supports diagrams, calendars, equations, and other features as extensions of Markdown syntax.
+* [tcort/markdown-link-check](https://github.com/tcort/markdown-link-check) - checks that all of the hyperlinks in a markdown text to determine if they are alive or dead
 
 # Creativity :bulb:
 * [TED](https://www.ted.com/) - [Videos] Ideas worth spreading, usually in the form of short, powerful talks (18 minutes or less)