Daniel Bachhuber

Ryan McCue

Joe Hoyle

Rachel Baker

Used together with the <a href="https://github.com/WP-API/OAuth1" rel="nofollow ugc">WP REST API OAuth 1.0a Server plugin</a>, this allows <a href="https://apps.wp-api.org/" rel="nofollow ugc">the WP RET API Authentication Broker</a> 
to connect to your site.
Read about how it works <a href="https://apps.wp-api.org/" rel="nofollow ugc">on the reference broker</a>, or <a href="https://apps.wp-api.org/spec/" rel="nofollow ugc">read the full specification</a>.

WordPress REST API – Authentication Broker

Used together with the WP REST API OAuth 1.0a Server plugin, this allows the WP RET API Authentication Broker

Automattic

Joey Kudish

Michael Adams (mdawaffe)

Em Shreve

Beau Lebens

See the <a href="http://dentedreality.com.au/projects/wp-keyring/" rel="nofollow ugc">Keyring Developer’s Guide</a> for more details.
Keyring provides a very hookable, completely customizable framework for connecting your WordPress to an external service. It takes care of all the heavy lifting when making authenticated requests, so all you need to do is implement cool features and not worry about these tricky bits.
Out of the box, Keyring currently comes with base Service definitions for:
<ul>
<li>HTTP Basic,</li>
<li>OAuth1, and</li>
<li>OAuth2.</li>
</ul>
And includes ready-to-use definitions for:
<ul>
<li><a href="https://500px.com/" rel="nofollow ugc">500px</a></li>
<li><a href="https://delicious.com/" rel="nofollow ugc">Delicious</a></li>
<li><a href="https://eventbrite.com/" rel="nofollow ugc">Eventbrite</a></li>
<li><a href="https://facebook.com/" rel="nofollow ugc">Facebook</a></li>
<li><a href="https://fitbit.com/" rel="nofollow ugc">Fitbit</a></li>
<li><a href="https://flickr.com/" rel="nofollow ugc">Flickr</a></li>
<li><a href="https://foursquare.com/" rel="nofollow ugc">Foursquare</a></li>
<li><a href="https://www.google.com/analytics/" rel="nofollow ugc">Google Analytics</a></li>
<li><a href="https://www.google.com/contacts/" rel="nofollow ugc">Google Contacts</a></li>
<li><a href="https://www.google.com/mail/" rel="nofollow ugc">Google Mail</a></li>
<li><a href="https://instagram.com/" rel="nofollow ugc">Instagram</a></li>
<li><a href="https://instapaper.com/" rel="nofollow ugc">Instapaper</a></li>
<li><a href="https://jetpack.com/" rel="nofollow ugc">Jetpack</a>/<a href="https://wordpress.com/" rel="nofollow ugc">WordPress.com</a></li>
<li><a href="https://linkedin.com/" rel="nofollow ugc">LinkedIn</a></li>
<li><a href="https://moves-app.com/" rel="nofollow ugc">Moves</a></li>
<li><a href="https://nest.com/" rel="nofollow ugc">Nest</a></li>
<li><a href="https://pinterest.com/" rel="nofollow ugc">Pinterest</a></li>
<li><a href="https://runkeeper.com/" rel="nofollow ugc">RunKeeper</a></li>
<li><a href="https://strava.com/" rel="nofollow ugc">Strava</a></li>
<li><a href="https://tripit.com/" rel="nofollow ugc">TripIt</a></li>
<li><a href="https://tumblr.com/" rel="nofollow ugc">Tumblr</a></li>
<li><a href="https://twitter.com/" rel="nofollow ugc">Twitter</a></li>
<li><a href="https://yahoo.com/" rel="nofollow ugc">Yahoo! Updates</a></li>
<li><a href="https://youtube.com/" rel="nofollow ugc">YouTube</a></li>
</ul>
You can very easily write your own Service definitions and then use all the power of Keyring to hook into that authentication flow. See the <a href="http://dentedreality.com.au/projects/wp-keyring/" rel="nofollow ugc">Keyring Developer’s Guide</a> for more details.
Contributions are welcome via <a href="https://github.com/beaulebens/keyring" rel="nofollow ugc">Github pull request</a>.

Keyring

An authentication framework that handles authorization/communication with most popular web services.

WordPress REST API – Authentication Broker vs Keyring