The free BD player they link to in that article is fairly crippled when you go the actual web site and look at the features - doesn't even play 1080p video or the "latest Blu-ray movie" whatever that means.
I got what I thought was the most legitimate looking one, MacGo Blu-ray Player for Mac. It's OK at many features. It has a 'trial' version, which has writing in the middle of the screen while you're watching movies. Not all that useful.