Hit 17 signups for a collab tool for small teams

Hey guys,
We just hit 17 signups at tinyteam.io
I'd like to know more about the kind of collaboration tool stack that teams here use. We found that to collaborate we had to use at least 4 tools but generally ballooned to more. Our goal is to get the basic set of features to collaborate in one place. We narrowed these down to
1.A real-time discussion module
2.An asynchronous decision module
3.Tasks
4.Static documents

We left out a module for calendar and video calls as of now.