If you're looking to plan out a project, share code design or craft a funny flowchart for friends or coworkers, Creately is a free webapp that offers a no-software tool with a nice and easy learning curve.
Most of Creately's diagram and illustration tools, ranging from dead-simple flowcharts to circuit diagrams, are free for signed-up users and allow sharing, embedding, publishing, commenting, and other collaboration tools for up to five people on publicly available works (paid accounts get more shared users and private postings). Like so many web tools, it strips down the interface of desktop offerings like Visio and makes it easier for first-timers to get a grasp on things. Click on a shape or line in your Creately chart, and a context menu offers all the options of moving, reshaping, resizing or whatever else you can do with it.
We might ask for a more updated look than the steel-gray toolbars of yore, but the end products—stamped with a subtle Creately logo, unless you fork out—are what really matter. Creately is free to sign up for and use.