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draw.io - Online diagramming application
Sketch Mirror - Preview your iOS designs directly on your devices
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.
Flowkit - Sketch library for user flows/content maps/annotations
PlantUML - PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.
Figma Mirror - Figma Mirror is an application that covers top trending designing or sketching ideas making your teamwork in a single environment and design better products from start to finish.