I am always on the look for tools that are simplistic and device agnostic, meaning they can be used across multiple devices. Witeboard is a web-based collaboration tool used to draw and brainstorm without the need for an account.
Witeboard - A Simplistic Tool for Collaboration
Simply visit Witeboard's website and begin using the drawing tools (i.e. pen, text box, eraser, and undo tool) to construct a drawing, mind map, etc.
Want to collaborate? Click on the "Share" button in the top-right corner of your screen, then share the URL copied to your clipboard.
I like several things about this tool. First, it is very simplistic to use, which can be used across various grade levels. This is perfect if you are working with younger students. Next, there is no need for a user account, which can be good and bad. It's good because you can use it right away; however, you may have students who like to use the anonymity of no user account to their advantage. Finally, you can use this tool on an iPad, laptop, MacBook, or Chromebook.