yEd

u are given a variety of items, ranging from basic shapes to small representations of computers, people and other objects. Bringing everything together is as simple as dragging the mouse from one side of the screen to another, while more complicated patterns only require a few additional mouse movements. yEd is a really interesting tool due to its ease of use and its scope. If you have to create visual diagrams regularly, don't hesitate to take a closer look at this app.