Tigerton

<p>Adds a sites field type to ACF. Allows for selection of one or multiple sites in a multisite network.<br />
This field type gives the user the option to select sites in a network. You might use this to have an ads post type which can be set to be displayed on a single or multiple sites in a network… just as an example!</p>
<h4>Compatibility</h4>
<p>This ACF field type is compatible with:</p>
<ul>
<li>ACF 5</li>
<li>ACF 4</li>
</ul>
<h4>Languages</h4>
<ul>
<li>English</li>
<li>Swedish</li>
</ul>
<p>Do you want to translate this plugin to another language? I recommend using POEdit (http://poedit.net/) or if you prefer to do it straight from the WordPress admin interface (https://wordpress.org/plugins/loco-translate/). When you’re done, send us the file(s) to jonathan@tigerton.se and we’ll add it to the official plugin!</p>
<h4>Other</h4>
<ul>
<li>Uses Select2 for ACF 5.</li>
<li>Completely WordPress Coding standard compliant.</li>
</ul>


Advanced Custom Fields: Sites Field

Adds a sites field type to ACF. Allows for selection of one or multiple sites in a multisite network.

jroakes

<p>This plugin will give you the ability to pull up any (non-Super Admin) user and in one click add that user(with a global role) to all sites in your MU install.  Likewise, if you want to remove a user from all sites it is one click as well.  CAUTION: WordPress has an optional mechanism when deleting a user from a site that will allow you to assign that users posts to another user.  I have ignored this for this release.  Please take a DB backups until you are used to this plugin and Multi-Site.</p>


Multi-Site User Replicator 3000

WP3.1 multisite "mu-plugin" that allows you to add a user to all sites or no sites. Just drop in mu-plugins.

Advanced Custom Fields: Sites Field vs Multi-Site User Replicator 3000