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Dia - Dia is a GTK+ based diagram creation program for GNU/Linux, MacOS X, Unix, and Windows, and is released under the GPL license.
malmal - Draw together on a nearly infinite canvas with your friends or with strangers.
draw.io - Online diagramming application
DrawPile - Drawpile is a drawing program that lets you share the canvas with other users in real time.
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.
Aggie.io - Draw a picture together with your friends in real-time over the internet in your browser.