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1Password, which also is a Windows and Android equivalent:

KeePassX works on OSX. https://www.keepassx.org/downloads

There's also others like 1Password that are popular on OSX.

I use 1Password in conjunction with Dropbox to keep my passwords secure and synced between OS X, Windows (XP and 7) and iOS. It's a fantastic product.

Lastpass stores your passwords centrally, and makes them available to any browser you use via a plugin/extension.

I use splashid. Not free but it works and they have an iPhone version. I also believe an older version of keepass was ported to Mac with the name KeePassX.

Edit: typo