asciiflow - Infinite ASCII diagrams, save to Google Drive, resize, freeform draw, and export straight to text/html.
draw.io - Online diagramming application
PabloDraw - PabloDraw is an Ansi/Ascii text and RIPscrip vector graphic art editor/viewer with multi-user capabilities.
Automatic Organizational Chart Generator - Turn your Excel employee list into an Org Chart with Photos!
JavE - JavE (Java Ascii Versatile Editor) is a free Ascii Editor.
OrgChart - Simplify organization chart maintenance, presenting, synchronization, without the complexity of drawing hassles - OrgChart draws them automatically.