Cocorico - Cocorico is a state-of-the art Open Source solution to create an Airbnb or Blablacar for anything.
wikiHow - wikiHow is a wiki based collaboration to build the world’s largest, highest quality how to manual.
MarketplaceKit - MarketplaceKit is a platform for building different types of online marketplaces.
Blurtit - Blurtit is a Q&A website. You can ask a question or answer on any question.
Sharetribe - Build your online marketplace business. You don't need a developer.
AllAnswered - Your Team's Collective Brain All-In-One Knowledge Management System Wiki + Q&A + Workflow + AI