VLC is one of the most famous video player out there. VLC is not only famous on Linux and BSD based operating systems, it is also famous alternative to Windows Media Player or Movies & TV app on Microsoft Windows as well.
On the other hand, Daum PotPlayer, even though free but not open source, is another great alternative to what you get on Microsoft Windows.
So, which one to chose? Well, it all comes down to user’s preference.