caugb

Create groups to organize your subscribed users and send them e-mails based on their groups or by user levels, capabilities or usernames. You can also send messages for anybody, directly by e-mail addresses. Besides that, you can use some information of the current user and of a selected publication (post or page), to personalize the message, that can take attached files, if you want. WPMailing offers support if you are using Xinha4WP or Dean’s FCKEditor, to write e-mails in your favorite editor.
<h3>Features</h3>
Once the plugin is activated, your administration panels will offer:
<ul>
<li>The ability to create groups and tag your users, by adding new features in Users section pages 
through Javascript (user.php, profile.php and user-edit.php). 
** This actions will not modify the WP original files.</li>
<li>An interface to modify names and descriptions of your groups (Manage > Groups) </li>
<li>An interface to compose and send e-mails to subscribed users, 
with some interesting features (Write > Write e-mail): 
** The ‘To’ field supports multiple e-mails and inclusions by user level, capability, group or username. 
** You can attach multiple files to the message 
** You can use values of an specific post or page 
** The e-mail can be personalized with informations of the user that will receive the message</li>
<li>An interface to set or update some WPMailing configurations (Options > Mailing) </li>
<li>Complete information about the sending process after you send any e-mail</li>
</ul>
<h3>Feedback</h3>
Your feedback are welcome. 
 Send any bug detections, suggestions, critics, etc. to: wpmailing(at)jsbrasil(dot)com 
 Thank you, Cau Guanabara.

WPMailing

Create groups to organize your subscribed users and send them e-mails based on their groups or by user levels, capabilities or usernames.

hardlyneutral

This plugin is built to display BuddyPress groups on the new user registration page. Groups can be displayed as:
<ul>
<li>a list of checkboxes</li>
<li>a list of checkboxes in a scrollable container</li>
<li>a list of radio buttons</li>
</ul>
New users will automatically join any of the groups selected during the registration process.
Options are available in the admin area to configure the title of the groups list on the registration page, the 
description of the groups list, whether private groups are visible to new users, the order in which groups are 
displayed, and how many groups will be visible.
<h3>Custom Styles</h3>
This plugin includes specific CSS for changing the way content is displayed. The default CSS will place the group after the “Profile Details” section and before the “Complete Sign Up” button on the register page. You can view <code>includes/styles.css</code> in this plugin directory to see how to target each element.
Here is a list of the current selectors used in <code>includes/styles.css</code>.
Groups section:
<pre><code>#registration-groups-section {
 float: right;
 width: 48%;
}
</code></pre>
Checkboxes:
<pre><code>.reg_groups_group_checkbox {
 margin: 0 5px 0 0;
}
</code></pre>
Form labels:
<pre><code>#buddypress .standard-form label.reg_groups_group_label,
.reg_groups_group_label {
 display: inline;
 font-weight: normal;
}
</code></pre>
Groups section – responsive:
<pre><code>@media only screen and (max-width: 480px) {
 #registration-groups-section {
 float: none;
 width: 100%;
 }
}
</code></pre>
List items:
<pre><code>.reg_groups_item {
 list-style: none;
}
</code></pre>
No groups message:
<pre><code>.reg_groups_none {
 font-style: italic;
 color: gray;
}
</code></pre>
Multiselect:
<pre><code>.reg_groups_list_multiselect {
 height: 8em;
 border: 1px solid #ccc;
 background: #fafafa;
 padding: 6px;
 overflow: auto;
}
</code></pre>

BuddyPress Registration Groups

Allows a new BuddyPress user to select groups to join during the registration process.

WPMailing vs BuddyPress Registration Groups