Lovely Charts is a free web-based tool for creating flow charts, site maps, network diagrams, and other visualizations with a drag-and-drop interface and a look somewhat upscale from black-line ...

Templates and symbols, exporting and printing ... mind maps, fishbone, network and UML diagrams, floor plans, office layouts, Gantt charts, business cards and flyers, wireframes, infographics ...

organizational chart, network diagram, or virtually anything else that mixes icons and pictures connected by lines. What’s the catch? The free account lets you store only one diagram online.