Gliffy

Gliffy can be used to draw vector diagrams. You can arrange lines, circles, rectangles, polygons, and arrows as you wish.

Drawing diagrams with Gliffy is very easy, as pre-defined symbols make your work easier. For example, there are symbols to represent furniture or computer networks. With Gliffy, you can color the outer edges or use color gradients. Your drawings are stored directly on the Gliffy server. Each save creates a new version that is accessible at any time. The program can save drawings in SVG, PNG, or JPEG formats.