Teachers and students would sometimes miss writing with their own bare hands in the computer era. Well unfortunately sometimes people have interpreted the coming of the computer as the destruction of the old ways. There is no truth in this as there is no single formula, in teaching, which would solve all problems! The new ways should compliment the old ones and not bury them at the cemetery.
How about writing with your hands on your computer?! Well the program Xournal uses a pen which might be moved with your hands as if you are writing on paper!! Imagine working on a pdf file using your own handwriting and then saving it as a pdf too! It's possible in Xournal. One can use it when working with past papers for example.
It's not just for writing in your own unique way, but there are many more advantages. One can use a highlighter; text tool; ruler; rectangle or lasso selection etc. One can add layers, pages or backgrounds. For more information just check the manual pages.