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draw.io - Online diagramming application
Monodraw - Monodraw allows you to easily create text-based art (like diagrams, layouts, flow charts) and...
Dia - Dia is a GTK+ based diagram creation program for GNU/Linux, MacOS X, Unix, and Windows, and is released under the GPL license.
Playscii - Full-featured ASCII art and graphic editor and game creation tool
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.
asciiflow - Infinite ASCII diagrams, save to Google Drive, resize, freeform draw, and export straight to text/html.