Project Management? (planning/logistics, not DAW)

I've recently started some projects with people that cannot always be in the same room at the same time. Lots of ideas are shared via audio snippets/demos before we land on rough ideas to finalize when we do sit down for a session. This can get pretty messy quickly, so I've started suggesting we name files as SONGNAME_year_month_day which is definitely a good start to keeping things in order.

Anyway, I'm hoping to do away with texting/messaging/emailing by and large and move over to some sort of project management tool that can streamline the whole process. Anyone familiar with doing this and have suggestions for software/apps/services etc?