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.

Konstantin Kovshenin

Retweet Anywhere for WordPress is a nice and easy way to allow your readers to instantly retweet your blog posts through their Twitter accounts. It uses the slick Twitter @Anywhere bundle which works through OAuth and never requires your readers to input their Twitter names or passwords.
The plugin is customizable, URLs could be shortened through bit.ly, the retweet format is defined by the blog administrator. Visitors can modify the tweet text before actually sending it to Twitter, allowing them to add hashtags or addressing somebody in particular.
<ul>
<li>Easy to install</li>
<li>Customizable message format</li>
<li>Shortcodes or manual PHP integration</li>
<li>Bit.ly shortened links</li>
<li>Customize Facebox, fading background, etc, super fancy!</li>
<li>Works fine when javascript is disabled</li>
<li>Includes an awesome customizable retweet widget!</li>
<li>Implement the RT button in your text widgets</li>
<li>Supports <a href="https://wordpress.org/extend/plugins/googl/" title="Goo.gl URL Shortening" rel="ugc">Goo.gl URL Shortening</a></li>
<li>On-going development</li>
<li>Literally anywhere!</li>
</ul>
YES, I do consider feature requests, and that is what makes this plugin work. The discussions go here: <a href="http://kovshenin.com/wordpress/plugins/retweet-anywhere/" title="Retweet Anywhere" rel="nofollow ugc">Retweet Anywhere</a>

Retweet Anywhere

Retweet Anywhere for WordPress is a nice and easy way to allow your readers to instantly retweet your blog posts through their Twitter accounts.

Twitter @Anywhere Plus vs Retweet Anywhere