Stormpath 是针对开发人员的身份验证和用户管理后端服务。您可以管理自己的用户集，验证其登录，并将用户分配给组（角色）。您的应用会拨打他们的服务器。

Stormpath is an authentication and user management backend service aimed at developers. You manage your own collection of users, verify their logins, and assign users to groups (roles). Your app makes calls to their server.

Parse 提供 Parse Social 服务，让您的应用通过Facebook或Twitter进行用户身份验证。 Parse正在被Facebook收购 （截至2013-04），所以我不知道这对他们的未来意味着什么。

Parse provides a Parse Social service that lets your app do user authentication through Facebook or Twitter. Parse is being acquired by Facebook (as of 2013-04), so I don't know what that means for their future.

Okta 是另一个。

Mozilla Persona 非常有前景，但可能尚未为现实世界做好准备。有一个名为 persona-ios 的iOS开源工具包。阅读有关如何在原生iOS应用中使用角色的讨论？。

Mozilla Persona is quite promising, but may not yet be ready for the real world. There is an open-source kit for iOS named persona-ios. Read a discussion on How to use Persona in a native iOS app?.

用户身份验证和身份服务似乎是一个新的但正在迅速发展的领域。

User authentication and identity as as service seems to be a new but burgeoning field.