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Graphity Diagram Editor

Need to create diagrams? This should help you do the job nicely.It will let you create:

• Flowcharts
• Social networks
• Computer networks
• UML diagrams
• Business process modeling diagrams

It does require Flash in order to work however.

Scribblar

.I may have already mentioned this resource, but sometimes there is no problem in repeating something again. This is a  Free Online Whiteboard and Collaboration Tool and it works really easily it is a multi-user whiteboard live audio image collaboration and text chat application. It's great for online training tutoring revising artwork and brainstorming. Features include a real-time multiuser whiteboard image upload and download, text chat, live audio, with no user or session limits.

Placepad

The online sketch pad for all your places. Placepad allows anyone to create an interactive floor plan with photos and notes in very a short amount of time. Placepad can be used any time you need to easily create a floor plan that can be viewed from any where on the web. Placepad asks you a few simple questions about your place and then generates most of the floor plan for you.

Penolo

Sketch and Share Drawings on Twitter. Scribble, tweet share. That's what it does.

DIY Chart Builder

DIY Chart Builder is a Web-based, simple and powerful online tool to create interactive charts and graphs from static or dynamic data which may be generated using any scripting language. Support full updates and data streaming without reloading the web page. Support 3D customization, including perspective, lighting, rotation, border skins, anti-aliasing, transparencies, isometric projections, shadows, and more. Support automatic and manual layout and alignment management. Support fully customizable legends. Support export chart in a variety of formats including BMP, JPG, PNG and EMF. With DIY Chart you can create charts for your website, blog and social network profiles, and DIY Chart may be useful for those who need to visualize financial, scientific or other type of data.