Neil Simon

Enter an email address and available contact information is displayed:
<ul>
<li>Photo</li>
<li>Name</li>
<li>Demographic information</li>
<li>Personal interests</li>
<li>Clickable social links (LinkedIn, Twitter, Facebook, …)</li>
<li>Recent <a href="http://twitter.com/" rel="nofollow ugc">Twitter</a> updates</li>
<li>Recent <a href="http://plancast.com/" rel="nofollow ugc">Plancast</a> plans</li>
<li>Optionally, emails the displayed contact information to any valid email address</li>
</ul>
Contact information provided by <a href="http://fullcontact.com" rel="nofollow ugc">FullContact</a>.
Email services provided by <a href="http://sendgrid.com/" rel="nofollow ugc">SendGrid</a>.

RainmakerMoxie

RainmakerMoxie (BETA-limited support) is an interactive sidebar widget. Enter an email address and it displays a photo, name, social links and more.

Sam Wilson

A simple address book plugin.
You can view and edit addresses (names, addresses, phone numbers, email 
addresses, etc.) in the administration interface (under Manage > Little Black 
Book), or embed a read-only, semantically marked-up, list of addresses in posts 
and/or pages. You can embed a list of your addresses in a blog post or page by 
putting <code>~LBB~</code> wherever you want the list to appear. The generated HTML is 
semantically marked-up, so you can fine-tune it’s appearance through your 
theme’s stylesheet. Here are the entries I use:
/—-:[ Little Black Book styles]:—-/ 
.timediff { color:red } 
.name, .address, .homephone, .cellphone { font-family:”Courier New”; font-weight:bold; font-size:larger; } 
.homephone { color:blue; } 
.cellphone { color:green; } 
.notes { font-family:Arial, sans-serif; font-size:smaller; }
<h3>Upgrading</h3>
There is no need to de-activate and then re-activate Addressbook to upgrade.
<h3>Download</h3>
The latest version is always available from the <a title="LBB" href="https://wordpress.org/extend/plugins/lbb-little-black-book/" rel="ugc">WordPress Plugin Repository</a>.
<h3>Donate</h3>
If you feel so inclined, a donation in any amount would be greatly appreciated.
<h3>Version History</h3>
1.0 First version in the repository
1.1.1 Changed the background color of the contact area for use with WordPress 2.5
1.1.2 Restored normal colors for the Edit and Delete links in the contact area. 
 (Thanks to John Marcotte)
1.1.3 Added “Cell: ” when the cellphone is not blank to make it clear, 
 especially when printed.
1.1.4 In listings, added a after the email addresses so the website appears on a 
separate line. (Requested by Aaron Patrick Michaud)

A simple address book plugin.  View addresses in the admin back-end or embedded
in a post or page.

RainmakerMoxie vs LBB