Memobuild is an online collaborative editor similar to Google Docs but focused on meeting the needs of writing large technical documents:

Icon for USER GUIDES and PRODUCT DOCUMENTATION
User Guides
& Product Documentation
Icon for TECHNICAL REPORTS
Technical
Reports
Icon for TECHNICAL BOOKS and LEARNING MATERIALS
Technical Books
& Learning Materials

General-purpose editor like Google Docs are ill-suited for this kind of work. Memobuild aims to solve this, most notably with an innovative editing engine that follows the WYSIWYM paradigm. It ensures a total separation of presentation and content while keeping a familiar graphical interface. Here is a screenshot of what editing looks like:

Memobuild is built by Julian in downtown Paris, and Andrey from the Russian backcountry. We're both experienced software engineers. Interested in joining us? We're looking for a teammate with a talent for marketing to help us grow. Get in touch.

If you're on Twitter, you can follow @memobuild.