I recommend 1Password for Mac, iPad, iPhone, and even Non-Apple platforms, although it’s primarily a program targetted at Apple users. I think it is the top product of this kind for the mac. I’ve been using it for many years, and except for one missing feature, I am very happy with it.
And regarding SwordMaker’s reply about you not needing such a program because of the OS-X keychain - it’s not the same thing (and btw, Windows has the equivalent of the keychain, too). 1Password let’s you store all kinds of info, generate secure passwords, fill in web forms, back up the password db, and can (optionally) synchronize the password database between computers. There is a free trial if you want to give it a whirl before buying.
Thank You!