asciiflow - Infinite ASCII diagrams, save to Google Drive, resize, freeform draw, and export straight to text/html.
Diagrams for Mac - A diagram editor for visualizing structures and processes
PabloDraw - PabloDraw is an Ansi/Ascii text and RIPscrip vector graphic art editor/viewer with multi-user capabilities.
Diagrammm - Fundamentals on data visualization
JavE - JavE (Java Ascii Versatile Editor) is a free Ascii Editor.
Wireflow - Create beautiful flowcharts