Penflip - Typewrite is a real-time collaborative writing environment with Markdown support, versioning and Dropbox syncing. Alternatives to Penflip for Web, Windows, Mac, Linux, iPhone and more.
Big Huge Labs Writer - Writer is a free online distraction free writing environment provided by Big Huge Labs.
Typewrite - The California Typewriter Company provides service and sales for all makes and models of typewriters, fax machines, printers, calculators, and even word processors.
Caret - Better Markdown Editor for Mac / Windows / Linux
GitBook - Modern Publishing, Simply taking your books from ideas to finished, polished books.
Emoji Saver - A macOS Screen Saver that animates more than 2000 emojis from Apple, Twemoji, Emoji One and Noto.