GeekRMX

This plugin allows you to easily add Twitter @Anywhere to your blog, enabling the @Anywhere features:
<ul>
<li>Auto-linkification of @usernames</li>
<li>Hovercards</li>
<li>Follow button</li>
<li>Tweet Boxes</li>
<li>Retweet button</li>
</ul>
You can enable and configure each function from the plugin settings page:
<ul>
<li>Customize the label, content and dimensions of your Tweet Boxes.</li>
<li>Display the post title and short URL into the Tweet Box.</li>
<li>Shorten your URLs with bit.ly or is.gd.</li>
<li>Insert custom Tweet Boxes by using shortcodes.</li>
<li>Clicking the Retweet button will launch a special Tweet Box with Lightbox effect (<a href="https://wordpress.org/extend/plugins/twitter-anywhere-plus/screenshots/" rel="ugc">screenshot</a>).</li>
<li>Choose from two Twitter birds to be displayed above the Retweet Box 🙂</li>
</ul>
Languages:
<ul>
<li>English (en_US)</li>
<li>Spanish (es_ES)</li>
<li>French (fr_CA)</li>
<li>Belorussian (be_BY)</li>
</ul>
In order to use @Anywhere, you must first register your blog for a free API key with Twitter. You can do so at the following URL: http://dev.twitter.com/anywhere/apps/new (<a href="https://wordpress.org/extend/plugins/twitter-anywhere-plus/faq/" rel="ugc">FAQ</a>)
<a href="http://www.ngeeks.com" rel="nofollow ugc">nGeeks.com</a>
<h3>Translations</h3>
<ul>
<li>English (en_US) [default]</li>
<li>Spanish (es_ES)</li>
<li>French (fr_CA) – <a href="http://siliticx.ca" rel="nofollow ugc">Charles Desaulniers</a></li>
<li>Belorussian (be_BY) – <a href="http://pc.de" rel="nofollow ugc">Marcis G.</a></li>
</ul>
You can help translating the plugin into your language. 
Use the <code>tap-default.po</code> file included with the plugin.

Twitter @Anywhere Plus

This plugin allows you to easily add Twitter @Anywhere to your blog, enabling the @Anywhere features.

David Davis

Easily allows your blog post or page to be retweeted. Currently being used by SocialBrite and other members of the social media community.
<h4>Features</h4>
<ul>
<li>
Allows you to change the source which you retweet, e.g. ” via @yourname”
</li>
<li>
Easily installation and customization
</li>
<li>
Better integration, allowing custom titles, related accounts
</li>
<li>
Integrates with WordPress MU
</li>
</ul>
<h3>Help</h3>
Please contact at us http://dcgws.com/contact/ for any questions

TweetButton

Still a favorite

Easily allows your blog post or page to be retweeted. Currently being used by SocialBrite and other members of the social media community.

Twitter @Anywhere Plus vs TweetButton