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Basil Chat - Design feedback via chat
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.
Bird Eats Bug - Saw a bug? Send an instant replay to engineers. It will come with console logs and everything. Developers will ❤️ you.
draw.io - Online diagramming application
Feedback by Pixelic - Painless design feedback and version control.
PlantUML - PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.