Built in. You can walk the tree or just tell vim to put you back to how the document was at a certain time. (i.e. Put the document how it was 1 minute and 20 se

Built in. You can walk the tree or just tell vim to put you back to how the document was at a certain time. (i.e. Put the document how it was 1 minute and 20 seconds ago) If you dont't know vim, I highly recommend learning it. (or emacs, both are great)