Kodetop

This plugin allow insert Tweet Button on your blog or site. The button can be customized in the settings page. Tweet Button can be positioned a the top, bottom of content. You can use text shortcut <code></code> and PHP function <code>wp_tweetbutton();</code> for manual insert.
Features
<ul>
<li>Easy install</li>
<li>Panel for easy configuration</li>
<li>Config Button Style</li>
<li>Config Language of Button</li>
<li>Config Your Twitter Account</li>
<li>Config Related Account</li>
<li>Config Tweet text</li>
<li>Config display locations (entries, pages, home page)</li>
<li>Config position in content (before, after, none)</li>
<li>Text shorcut: <code></code></li>
<li>PHP Function: <code>wp_tweetbutton();</code></li>
</ul>
Manual usage of WP-TweetButton:
For include into post content use: <code></code>
For include in your template use: <code><?php wp_twitterbutton(); ?></code>
For more information visit <a href="http://blog.unijimpe.net/wp-tweetbutton/" title="plugin website" rel="nofollow ugc">plugin website</a>

WP-TweetButton Plus

This plugin allow insert Tweet Button on your blog or site.

bozdoz

Let your visitors share a quote from your pages with Quote Tweet!
When a visitor selects text from one of your pages, a prompt appears for them to share the quote, with the current page URL, to Twitter.
Check out the source code on <a href="https://github.com/bozdoz/wp-plugin-quote-tweet" rel="nofollow ugc">GitHub</a>!

Quote Tweet

A plugin that shows a link when a user selects text on your WordPress site to quote that text, with the current URL, in a tweet.

WP-TweetButton Plus vs Quote Tweet