Fairly certain that fb2k has never been FOSS or can you point to where that's not the case as that'd be far more interesting than the point of this thread.
I use Foobar on my PC daily but didn't even know it was available on Android, so thanks! Musicolet is also a great Android player without all the BS (ex: can run mp3 files copied to the device with no internet connnection)
"McDonalds is a place to rock, It is a restaurant where they buy food to eat, It is a good place to listen to the music, People flock here to get down to the rock music." - Rock 'N Roll McDonalds
"Batman beat the hell out of me and knocked me to the floor, I got back up and knocked him to the floor, He was being such a jack off" - I Whupped Batman's Ass
"This beast killed as many as 100,000 people / It's wings can flap like a bird / It can break a glass / It can also stab you in the ass" - The Chicken Cow
Same here, using Winamp 2.95 on a HiDPI screen as my main audio player.
The best feature that it seems no other player has reproduced yet is being able to hit the J key to do an instant search for a song, with 0 latency: the search narrows down the songs as fast as you hit the keys.
But I've noticed that there are now a few files that sound scratch when played, perhaps they're 48 kHz or something...
Same thing in Clementine, except you don't even have to press J. Just type your search when the window is focused and the filter bar will catch the keys.
Tiny, fast, simple, does the job.
There's an Android version too, which is my go-to audio player, because of its simplicity.
Both FOSS.