You download VLC Media player, which is a free player. VLC supports unencrypted Blu-ray discs. Unfortunately, commercial Blu-ray movies will generally be encrypted. You can try using the third-party AACS dynamic library to make VLC play encrypted Blu-ray discs — if you’re looking for a Blu-ray player and don’t want to shell out any money, it’s worth a shot.
Actually, Mac Blu-ray Player is the best software to play blu-ray discs on Mac. You can get this Mac Blu-ray Player on Amazon.