In our company we use an Wiki to document our projects.

I am missing a way to sketch simple overview diagrams.

Now I search a tool to create such diagrams.

Requirements:

• read ascii/utf (not svg)
• re-usable entities: Figures for database, actor (person), internet (cloud), ... should be easy to re-use.
• output format: svg or png.
• Relations between the entities

Main focus is on easy of use. I don't need all things which are possible in UML.

Use case: I want to draw images like this: