For Android, Amaze is the best open source file explorer I have used. Back when I didn't care about open source, I liked Solid Explorer.
Even though I'm a Solid Explorer user, I agree with you. Amaze is really good. I'm a stingy SOB so I'm sticking with Solid Explorer since I bought it. I know that makes no sense. There's no logic in feelings.
Solid Explorer 2 for Android. Been using the it for many years.
I use X-Plore. it has two panes that you can swipe between and it got an archive manager and an app manager. also root.
Mixplorer
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