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.
Linked Ideas - A macOS/iOS apps to treat ideas as links of concepts.
JavE - JavE (Java Ascii Versatile Editor) is a free Ascii Editor.
Org Chart Designer Pro - A simpler way to create and publish charts and diagrams.