MaintainX - Manage your Maintenance and Operations. Without the paper stacks.
Documize - Enterprise-grade wiki and knowledge management platform
Dozuki - Dozuki is a web-based tool for creating and distributing step-by-step documentation.
HackMD - Fast and flexible, real-time collaborative markdown, inspired by Hackpad.
Poka.io - Communication and training solutions for manufacturers.
ReadTheDocs - Spend your time on writing high quality documentation, not on the tools to make your documentation work.