Damian Gostomski

The Imposter plugin allows site administrators to take on the role of another user. This is useful for development and testing purposes, as well as the ability to troubleshoot user issues without needing the user password.
It will add a link for each user in the users list, which will log the administrator as that user. They’re then logged in as that user and are no longer an administrator, until they logout of the user session, at which point they’re logged back in as themselves.

Imposter

Allows administrators to take on the role of another user for development, testing and troubleshooting purposes without knowing the users password.

bretterer

stormpath

With this plugin, you are replacing your local users with users inside of the Stormpath ecosystem. We have 
designed this plugin to look and act the same as the built in user authentication, but give you the power 
of Stormpath authentication.
<h3>Stormpath</h3>
Stormpath is a complete and easy Identity management API for software teams building web, mobile, and API-driven applications. Powerful, pre-built authentication and user management eliminates the cost and security risks of developing and maintaining Identity in house. With Stormpath, developers can launch applications faster and focus on the core features that make their projects a success.
Stormpath is a cloud-based user data store with a private deployment option. Features include user registration, authentication, authorization, user profiles, single sign-on, multi-tenancy, token authentication, and API key management. Stormpath’s advanced security measures safeguard user data and promote compliance. The service includes robust open source SDKs for popular web and mobile frameworks, including Node.js, AngularJS, Java, PHP, Python, Ruby, .NET, iOS, and Android.
The Stormpath REST API lets developers quickly and easily build a wide variety of user management functions they would otherwise have to code themselves.

Stormpath

Give your WordPress website the power of Stormpath Authentication.

Imposter vs Stormpath