Alternatives To Microsoft Passport?

Passport-less asks: "With more and more Web sites requiring registration, I believe 'one login for multiple sites' services (like Microsoft Passport) will become more and more popular. Are they are open-source or community-based projects similar to Passport available? Passport's SDK is currently only available on Win2K (big surprise) -- although support for many UNIX-like platforms is planned in Q2 and Q3. I also don't like the idea of a profit-seeking corporation being in charge of a service like this especially Microsoft, considering their past security record. I also don't like their high fees, so I really think a community-oriented system with high deposits or bonds would be the best solution. Comments, anyone?"