The best alternatives to Pencil are Scrivener, Draft, and Tiny Docs. If these 3 options don't work for you, we've listed a few more alternatives below.
When you share your document using Draft, any changes your collaborator makes are on their own copy of the document, and you get to accept or ignore each individual change they make.
Plume is a Windows and Mac app that provides an expanded editor for working on documents. You can create lists where you contain text. Manage your lists how you would like: add, delete, reorder, rename and more...