This is a very cool program that I started out using for the purpose of annotating pdf files (you can use it to write or draw directly onto any pdf file and then save the result as a pdf file, which is a very useful thing to have available) but I've lately started using it for other things like notes and calculations and diagrams and general "figuring".
The webpage gives you an idea of what it can do. Simply stated, its a blank piece of virtual paper and you can write on it, type on it, draw on it and paste stuff on it.
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