scribu

AppThemes

With this plugin, super-admins can:
<ul>
<li>view any theme on any site, without enabling it</li>
<li>access any site through Admin Bar -> My Sites, without having a role on it</li>
</ul>
Intended for <a href="http://scribu.net/wordpress/the-future-of-multisite.html" rel="nofollow ugc">small Multisite installs</a>.

Hyper Admins

Simplify administration tasks for super-admins.

yanniks

This is the Shariff for WordPress plugin based on c’t Shariff.
For more information, check out the original <a href="https://github.com/heiseonline/shariff" rel="nofollow ugc">GitHub project</a> and the <a href="http://ct.de/shariff" rel="nofollow ugc">c’t information page</a>.
<blockquote>
Shariff enables website users to share their favorite content without compromising their privacy.
Facebook, Google+ and Twitter supply official sharing code snippets which quietly siphon personal data from all page visitors. Shariff enables visitors to see how popular your page is on Facebook and share your content with others without needless data leaks.
Shariff <code>(/ˈʃɛɹɪf/)</code> is an open-source, low-maintenance, high-privacy solution maintained by German computer magazine c’t and heise online.
</blockquote>
Shariff supports sharing buttons for Facebook, Twitter, Google+, LinkedIn, Pinterest, Reddit, StumbleUpon, XING, WhatsApp and mail. 
Select which color you want, set the button location, select the orientation fitting most to your website and set the TTL just as you want.

Shariff for WordPress

Shariff enables website users to share their favorite content without compromising their privacy.

Hyper Admins vs Shariff for WordPress