Docshare.tips - You can upload your documents.
Documize - Enterprise-grade wiki and knowledge management platform
SlideShare - Discover, Share, and Present presentations and infographics with the world’s largest professional content sharing community.
HackMD - Fast and flexible, real-time collaborative markdown, inspired by Hackpad.
DocDroid - DocDroid is a service for sharing document and slides.
ReadTheDocs - Spend your time on writing high quality documentation, not on the tools to make your documentation work.