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?
Same for me, switched from Total Commander, since Material Files is a bit more comfortable to use. For some reason I do not get the same upload speeds to my home server though, and I cannot figure out why.
That said Total Commander sometimes lost connection and I had to start over, so I am ok with slower upload if its more consistent.