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Libre office draw is wonderful, it can edit pdf docs at ease. It’s crazly powerful compared to paint 3d
MotionArtist - Comic creator + animation + sound
draw.io - Online diagramming application
Pixton - Our goal at Pixton Comics is to enable everyone in the world to make comics.
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.
Frameless Space - DIY comics app. Be creative, it’s easy.
PlantUML - PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.