• .0.original: The original cloned on 02/28/2019 from https://github.com/emacsmirror/undo-tree.git

• .0.private: Used by @lawlist with a custom build of Emacs and custom Lisp files.

• .0.public: A public version that is a fork of the original. See the comments at the outset of undo-tree.el for a listing of the modifications and new features. This fork contains substantial modifications to the original code, and was last compatible with Emacs 25 -- the last revision was 12/03/2017. See the list of open Github issues: https://github.com/lawlist/undo_tree/issues