There are few choices. I only know Bridge Baron. Version 10 for OS9 only is/was a really great Mac app. Everything looked very very attractive and felt right. I loved playing Bridge with Bridge Baron. Sadly, now that I have a Macbook I've had to upgrade to Bridge Baron 18. It's nowhere near s nice as 10 was. As far as I can tell, they've simply ported the ugly Windows version to the Mac. Esthetics are big with me (that's the main reason I use Macs). This latest version is very disappointing. That's all I can tell you
Judging from the responses here it clearly looks like an area where Mac or made for Mac could use some new software. I agree that aesthetics hold a large part in whether one will enjoy the app or not and I've heard that many bridge apps or online bridge sites are horrendous in this regard. I'll check out Bridge Baron and thanks for the responses. Anyone ever played www.bridgedoctor.com ?
Having tried a number of bridge programs over the years, I have yet to find one that bids and plays well enough to let even a beginner learn about the game. I understand there are some PC versions that are somewhat better, but not one Mac program.
If I may suggest, however, playing online with other people who are interested in learning is a much better way to go about it, plus it is much more social. [OKBridge|http://www.okbridge.com] is an online bridge club that has been around since [1990|http://www.okbridge.com/new-signup/deployed/about.php] (yeah, it's about as old as the Internet) and has 13,000 members all over the world. I've played at tables with players from four different continents! There are complete beginners and world champions, and a wonderful friendly atmosphere.
Sad to say, [Pogo|http://www.pogo.com], while free, does not have the same ability to sustain a beginner. You can play, but be prepared to endure frustration. I play chess and backgammon on Pogo, but the bridge rooms are sorely lacking, and the level of play is terrible.