A plugin for Etherpad Lite that allows for simple insertion of a signature that contains the date and username.
I have it revisioned on GitHub @itguy51/ep_signature and I publish it to npm every week if it has been updated within that week (See Update Policy at the bottom)
I saw the idea on the Etherpad Lite plugin wishlist, and realized it would be usable in my case, so I decided to contribute.