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draw.io - Online diagramming application
Waterpebble - Your little water saver
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.
Apple - Available on iOS
PlantUML - PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.
Blocks - Empowering designers to build great websites without writing a line of code. For web and OS X.