IINA is the modern video player for macOS.
mrViewer is a professional flipbook, audio, and video player with 4K support for your machines.
AGL Player is a video player with a modern interface and support for a number of video file formats.
FloatPlayer adds a floating browser playing your YouTube videos on top of other apps in Mac.
iVideo 7 helps you manage, play, and share videos conveniently on your Mac.