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Libre office draw is wonderful, it can edit pdf docs at ease. It’s crazly powerful compared to paint 3d
Storyboard That - Storyboard That is the world's best online storyboard creator.
draw.io - Online diagramming application
Storybird - Visual storytelling community
yEd - yEd is a free desktop application to quickly create, import, edit, and automatically arrange diagrams. It runs on Windows, Mac OS X, and Unix/Linux.
Storyboarder - Storyboarder makes it easy to visualize a story as fast you can draw stick figures.
PlantUML - PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.