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Neovidya - Neovidya provides structured access to high-quality educational content.
draw.io - Online diagramming application
Flowkit - Sketch library for user flows/content maps/annotations
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.
Sketch Tricks - Articles for Sketch
PlantUML - PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.