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Libre office draw is wonderful, it can edit pdf docs at ease. It’s crazly powerful compared to paint 3d
SmartDraw - Instead of starting with a blank screen, SmartDraw gives you the exact template you need.
draw.io - Online diagramming application
Creately - The new interface for work to ideate, plan, and execute
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.
Dia - Dia is a GTK+ based diagram creation program for GNU/Linux, MacOS X, Unix, and Windows, and is released under the GPL license.
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.