我会投票给OpenID CFC ---但也许这是因为我是项目的开发人员...; - ）

I'd vote for OpenID CFC---but maybe that's because I'm one of the project's developers... ;-)

所以虽然我显然有偏见，这里是我推荐OpenID CFC的原因：

So although I'm obviously biased, here's why I recommend OpenID CFC:

• CFKit OpenID仅支持OpenID 1.1


• CFOpenID支持OpenID 2.0，但似乎并未显示为更新很久。

我不知道Jason什么时候看着图书馆或者他有什么问题，如果你想使用OpenID CFC有什么问题。当我更新它以支持OpenID 2.0时，我做了几个改变，真正简化了API，所以它真的很容易使用。

I don't know when Jason looked at the libraries or what issues he had, but you shouldn't have any issues if you want to use OpenID CFC. When I updated it to support OpenID 2.0 I made several changes that really simplified the API so it's really easy to use.

RPX也是一个很好的选择。但它不是免费的，因为它是一个第三方系统，你放弃了对系统的一点点控制。

RPX is also a good alternative. But it's not free and since it's a third-party system you are relinquishing a little bit of control over the system.