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Vossier - Fortnightly UI design briefs, straight to your inbox.
Dia - Dia is a GTK+ based diagram creation program for GNU/Linux, MacOS X, Unix, and Windows, and is released under the GPL license.
GoodBrief - A random generator for design briefs.
draw.io - Online diagramming application
Create Brief - Create a free shareable design brief. No email needed.
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.