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Libre office draw is wonderful, it can edit pdf docs at ease. It’s crazly powerful compared to paint 3d
draw.io - Online diagramming application
Diagramo - Diagramo is an online flowchart software - diagrams (create, edit and share)
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.
Modelio - Modelio is an open source modeling tool supporting natively UML, BPMN and model exchange with XMI.
Dia - Dia is a GTK+ based diagram creation program for GNU/Linux, MacOS X, Unix, and Windows, and is released under the GPL license.
UML Designer - UML Designer provides a set of common diagrams to work with UML 2.5 models.