LucidChart

LucidChart is an online collaborative flow-charting application designed from the ground up to be the fastest, easiest way to collaborate on and publish flow charts online. There’s no need for Flash or any other browser plugins, and all features work well in Internet Explorer 6 and 7, FireFox, Safari, and Chrome.

LucidChart stands apart from the rest of the online diagramming tools:

The user interface is complete and streamlined. Simple tasks like drawing a line from one block to another are one-click jobs. Zooming in and out, copying and pasting groups of blocks and lines, and restyling the diagram are all simple and obvious, as they should be.

Collaboration works. Unlimited users are able to edit a document at the same time, and changes are automatically merged among users. Integrated group chat among editors of a document makes working together easier.

Obvious functionality missing in competing products is implemented well. Multiple pages are allowed in a single document. Page size is adjustable. Links between pages can be set up without elaborate hacks and workarounds.

The interface is not cluttered with dozens of useless features to expand the feature bullet-list on the marketing site. You will find what you need, and very little more.

LucidChart does not require Flash or any similar browser plugin technology. While consumer computers have very high penetration of Flash, despotic corporate IT administrators often restrict these technologies.