Documize - Enterprise-grade wiki and knowledge management platform
Bloomfire - Let Bloomfire help you get organized! Organize your content, build your company knowledge base and help your employees to be more successful.
HackMD - Fast and flexible, real-time collaborative markdown, inspired by Hackpad.
Confluence - Confluence is content collaboration software that changes how modern teams work
ReadTheDocs - Spend your time on writing high quality documentation, not on the tools to make your documentation work.
Tettra - Tettra is a company wiki that helps teams manage and share organizational knowledge.