yEd

YEd is a unique tool that lets you create high quality diagrams with the most straightforward and easy way.

You can create your diagrams from your scratch, draw them in the hand with the mouse, or import the Excel file, which you can choose but you can edit and change. Also, once you have completed a diagram, you can export it in any format such as PNG, JPG, SVG, PDF, SWF etc.

To draw your diagrams, you are given various items, from basic shapes to small representations of computers, people and other objects. As the screen is as easy as pulling the mouse on one side of the side as everything is bringing together, more complex patterns only require some extra mouse movement when needed.

YEd is easy to use and because of its scope, it's really an interesting tool. To create a regular viewing diagram, do not hesitate to see this app intensively.