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Duolingo - Duolingo is a free language learning app for iOS, Windows and Android devices. The app makes learning a new language fun by breaking learning into small lessons where you can earn points and move up through the levels. Read more about Duolingo.
draw.io - Online diagramming application
Mondly - Learn 33 languages in 500 bite-size lessons and 14 conversational modules.
LucidChart - LucidChart is the missing link in online productivity suites. LucidChart allows users to create, collaborate on, and publish attractive flowcharts and other diagrams from a web browser.
MondlyAR - Learn languages in augmented reality
PlantUML - PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.