What is the best way to store and share customer / marketing intelligence?

I just re-joined an old small tech company that I used to work for. I'm UX and marketing and I'm trying to improve things with the use of analytics and customer intelligence and trying to avoid the trap of overthinking these things. The company doesn't have the culture of sharing information so teams work in silos. The good thing is that the company has a strong engineering culture, so I don't think I will have to fight many battles as long as what I do makes sense and is logical. My question is: what is the best way of storing and sharing user knowledge? I'm creating user personas, user journeys and also collecting information from chat (olark), customer interviews and usability studies. I thought about slack, but I haven't used that yet. I'm looking into something…