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UMLGraph - UMLGraph is a professional automated drawing tool that allows the designers the declarative specification and drawing of UML class and sequence diagram.
Monodraw - Monodraw allows you to easily create text-based art (like diagrams, layouts, flow charts) and...
draw.io - Online diagramming application
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.
asciiflow - Infinite ASCII diagrams, save to Google Drive, resize, freeform draw, and export straight to text/html.