I use one called X-Plore. It’s actually very good. Even has a WiFi server, conpressed archive support, etc. but the downsides are that it’s close sourced and some features are behind a paywall (though IMO they are worth it).
So I was thinking of moving to some free or open source software. Any recommendations?
Material Files is fantastic.
FOSS (free and open-source), and supports root, if you need it.
Amaze is amazing (I’m sorry, it was stronger than me) too.
I forgot to mention that *both of them* are open-source.