Documize - Enterprise-grade wiki and knowledge management platform
Dozuki - Dozuki is a web-based tool for creating and distributing step-by-step documentation.
Boardist - Personal workspace for all the data
Bloomfire - Let Bloomfire help you get organized! Organize your content, build your company knowledge base and help your employees to be more successful.
ReadTheDocs - Spend your time on writing high quality documentation, not on the tools to make your documentation work.
REWO - REWO is a knowledge documentation and distribution solution, which drastically improves capturing, visualizing and communicating knowledge.