Kifi for Teams - Knowledge sharing and collaboration for teams
Pocket - When you find something you want to view later, put it in Pocket.
Lunyr - A decentralized crowdsourced encyclopedia.
Raindrop.io - All your articles, photos, video & content from web & apps in one place.
Document360 - Self-service knowledge base software focused on SaaS Products & Enterprise Software Projects.
Tettra - Tettra is a company wiki that helps teams manage and share organizational knowledge.