MPV Player for OSX
mpv is a fork of mplayer2 and MPlayer. It shares some features with the former projects while introducing many more.
Go to the website for the latest release and more information. http://mpv.io
I know this is free but so many people do not know about it.
It's the most efficient x265 (HEVC) player I have found and tested.
Plays 4k x265 flawlessly on my MacBook Pro (Late 2013)