GitHub + Slack Integration - Full visibility into your GitHub projects right inside Slack
Supernotes - The fastest way to take notes and collaborate with friends. Create notecards with Markdown, LaTeX, images, emojis and more. Get started for free!
Stack Overflow Documentation - A crowdsourced developer documentation
Document360 - Self-service knowledge base software focused on SaaS Products & Enterprise Software Projects.
ask-stack - Get answers from Stack Overflow directly in the Atom editor
Kifi for Teams - Knowledge sharing and collaboration for teams