Fast free easy way to create charts and diagrams online
If you want to create charts online quickly and for free, check out draw.io. Up till today I was using Visio which is good but I only have it on my laptop so I have to start it and only can use it on that computer.
With draw.io you can create instantly and export pngs and save the file as xml. Now you can save the files to your Google Drive, just go to http://drive.draw.io to start.