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draw.io - Online diagramming application
Uxcel - The easiest way to learn UX/UI design
Dia - Dia is a GTK+ based diagram creation program for GNU/Linux, MacOS X, Unix, and Windows, and is released under the GPL license.
UX Challenges - Done reading about UX? Start doing it.
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.
Weekly UX Exercise - Receive challenges top companies use to interview designers