Technically two people are a team, right? :P
If it was only me I would use Org Mode, but that's not the case.
Our projects are all artistic in nature, mostly screenplay collaborations, film criticism, YouTube, podcasts, etc . It's easy to get overly excited about this kind of stuff, but we need to follow up too. And we don't have an external demand that would incentivize us to put in the effort.
Even though we're only two people, we both have trouble sustaining long term goals, organizing schedules and information. My partner is a brilliant writer, but for him concentrating is even more of an issue than it is for me. He needs something visual. This tool must also work very well on mobile since he currently does not own a computer. It also must be graphical and easy to learn for someone that only knows Windows and MacOS.
To be more specific, I'm looking for something that allows me to track what we have done, what we're doing now and what we're going to do next. A calendar and some kind of notification system would be nice, but, as I say in the title, it must be free (I'm Brazil and our currency is worth nothing, so even the cheap is expensive for us...).
Google gives me dozens of results, reviews, etc, but it's hard to assess how good each tool is without experimenting it. And I would like to avoid learning an entire platform just to conclude it is subpar (I know this is largely unavoidable, but we can do better with a little help from our friends!).
Any suggestions? :D
 Even though our projects are artistic, their execution involves many things that are not artistic at all, such as understanding, budgets, legislation, registering our works with the copywriting authority, participating in public contests, networking, etc. There are lots of menial tasks that are easy to forget.