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?
This one. Allows you to also use sftp to access your remote files over SSH
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.