Dia isn't the only alternative to Visio out there (I've also told you about Project Draw, an online app, for example) but Dia is small, smart, and free -- definitely worthy of your attention.

Physicists like to represent forces on an object by drawing a Free Body Diagram. This is simply a representation of an object and a graphical representation of all the forces acting on that object.

As always, the description provider must determine both the intent of image and the intended audience. The diagram is titled "Carbon Cycle." Colorful pictures depict farms, forests, rivers, oceans and ...

This example illustrates the use of PROC NETDRAW to draw two networks ... Three ID variables are used to specify the text that is to be placed within each node. The flow diagram is shown in Output ...