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Playscii - Full-featured ASCII art and graphic editor and game creation tool
Dia - Dia is a GTK+ based diagram creation program for GNU/Linux, MacOS X, Unix, and Windows, and is released under the GPL license.
PabloDraw - PabloDraw is an Ansi/Ascii text and RIPscrip vector graphic art editor/viewer with multi-user capabilities.
Graphity - Graphity is a diagram editor that can be used to quickly and effectively generate drawings and to...
Ascii Generator 2 - Ascii Generator 2 (Ascgen2) is an application to convert images into high quality ASCII art - text...
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.