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.
Sublime Text - Sublime Text is a sophisticated text editor for code, html and prose - any kind of text file. You'll love the slick user interface and extraordinary features. Fully customizable with macros, and syntax highlighting for most major languages.
Typewrite - The California Typewriter Company provides service and sales for all makes and models of typewriters, fax machines, printers, calculators, and even word processors.
Trix - A rich text editor for everyday writing.
GitBook - Modern Publishing, Simply taking your books from ideas to finished, polished books.
Atom - At GitHub, we’re building the text editor we’ve always wanted: hackable to the core, but approachable on the first day without ever touching a config file. We can’t wait to see what you build with it.