Source: http://lifehacker.com/5539057/diagram-designer-is-a-free-and-simple-diagram-designer
Diagram Designer offers easy chart creation with a library of flowchart nodes and connectors. Text in each element is customizable with a variety of tags and connectors automatically attach to points on each node. Every element is scalable and your charts are exportable in a variety of formats like JPG, PNG, and more.
Diagram Designer supports customization of nodes and importing of image files to the flowchart but it really shines with quick bare bones flowchart creation. Diagram Designer is freeware, Windows only. Have a favorite flowchart application online or off? Let's hear about it in the comments.