Dia is an application designed for quick creation of structured diagrams such as simple, line-based illustrations, flowcharts, UML charts and network diagrams. Being a vector based tool, there is some ...

Dia is an editor for diagrams, graphs and charts. It is the perfect tool to use for explaining a process or procedure in a concise, standardized visual representation. You will find numerous ...

In fact, their webpage says that Dia is roughly inspired by Visio, although it is a good alternative to other charting and diagram software packages as well.