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Whimsical - The visual workspace for teams.
draw.io - Online diagramming application
Jot - The no-fuss way to take notes
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.
iTunes - Media player, media library, Internet radio broadcaster, and iPhone device management application
PlantUML - PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.