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.
Image Blur - Hide your sensitive data with a click
draw.io - Online diagramming application
DataMask.tech - Mask private data before taking screenshots
PlantUML - PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.
GitGuardian - Detect secrets in source code, public and private!