.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.
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.
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.