FabricJS
Fabric.js is a powerful and simple
Javascript HTML5 canvas library,.
DotEditor
A graphical editor for dot files for use with GraphViz to generate diagrams.
Bizagi Modeler
Business Process Modeling Software. Bizagi BPM software puts simplicity first.
ASCIIator
Free, online converter to generate colored ASCII art.
Sankey Diagram
Professional drawing tool to create Sankey Diagrams.
PlantText
PlantText is an online tool that quickly generates images from text. Primarily, it is used to generate UML (Unified Modeling Language) diagrams. It is based on a text language called PlantUML.
Shapes
Shapes is a simple, elegant diagramming app for OS X.
Flowchart.js
Draw SVG flow charts from simple text representations of the diagrams.
DIagrams Through Ascii Art
Java command-line tool to convert ASCII diagrams to bitmaps.
Chart Mage
Generate sequence diagrams and flowcharts at lightning speed.