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.

CoSchedule

This WordPress plugin allows you to easily create tweetable content for your readers. Use pullquotes and custom messages inside the body of your blog post to highlight your content for the reader and make it simple for them to share on Twitter.
This is a plugin by CoSchedule, the <a href="https://coschedule.com" rel="nofollow ugc">all-in-one content marketing editorial calendar for WordPress</a>.

Click To Tweet

This plugin allows you to create beautiful Click To Tweet boxes anywhere in your blog post.

WP-TweetButton Plus vs Click To Tweet