Typewrite - The California Typewriter Company provides service and sales for all makes and models of typewriters, fax machines, printers, calculators, and even word processors.

Documize - Enterprise-grade wiki and knowledge management platform

HeyCopy - Become a better writer with a copy buddy

HackMD - Fast and flexible, real-time collaborative markdown, inspired by Hackpad.

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.

ReadTheDocs - Spend your time on writing high quality documentation, not on the tools to make your documentation work.