Diagrams for Mac - A diagram editor for visualizing structures and processes
asciiflow - Infinite ASCII diagrams, save to Google Drive, resize, freeform draw, and export straight to text/html.
AutoCloud - Loan origination & document management for lending companies
PabloDraw - PabloDraw is an Ansi/Ascii text and RIPscrip vector graphic art editor/viewer with multi-user capabilities.
Plectica - Easily diagram anything, together
JavE - JavE (Java Ascii Versatile Editor) is a free Ascii Editor.