[functionmouse]

mpv is really good but a little light on the GUI; I recommend VLC for most people

[whatevaa]

SMPplayer is a frontend for mpv which I use and like.

[notpushkin]

It also has MPC GUI mode for nostalgia :)

On macOS, IINA is my go-to mpv wrapper nowadays, and last time I tried, Haruna is pretty good on KDE.

[rasz]

Yep, highly recommend https://www.smplayer.info with dark skin :)

[BoingBoomTschak]

There's https://github.com/mpvnet-player/mpv.net for Windows lusers.