asciiflow - Infinite ASCII diagrams, save to Google Drive, resize, freeform draw, and export straight to text/html.
Diagramo - Diagramo is an online flowchart software - diagrams (create, edit and share)
PabloDraw - PabloDraw is an Ansi/Ascii text and RIPscrip vector graphic art editor/viewer with multi-user capabilities.
Modelio - Modelio is an open source modeling tool supporting natively UML, BPMN and model exchange with XMI.
JavE - JavE (Java Ascii Versatile Editor) is a free Ascii Editor.
ARIS Express - ARIS Express is based on the proven ARIS methodology and industry standards.