Figma - Team-based interface design, Figma lets you collaborate on designs in real time.
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.
Caret - Better Markdown Editor for Mac / Windows / Linux
Typewrite - The California Typewriter Company provides service and sales for all makes and models of typewriters, fax machines, printers, calculators, and even word processors.
Notion - All-in-one workspace. One tool for your whole team. Write, plan, and get organized.
GitBook - Modern Publishing, Simply taking your books from ideas to finished, polished books.