The best alternatives to Shy Editor are Scrivener, Draft, and Tiny Docs. If these 3 options don't work for you, we've listed a few more alternatives below.
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Scrivener is the go-to app for writers. Used by bestselling novelists and new writers alike, no matter how you like to write or what you're writing, Scrivener unites everything you’ll need to create, research and arrange your manuscript in a single, powerful package.
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. Get 'TXT' or 'PDF' document as output files.