wokamoto

This is a plugin creating a new tweet including a URL of new post on your wordpress.
You can use specific tweet phrases by post authors. 
And You can also tweet short URL of your domain if you introduce the plugin <a href="https://wordpress.org/extend/plugins/short-link-maker/" title="Short link maker" rel="ugc">Short link maker</a>.
PHP5 Required.
<h4>Localization</h4>
<ul>
<li>English (en) – <a href="http://www.odysseygate.com/" title="Odysseygate.com" rel="nofollow ugc">odyssey</a></li>
<li>Japanese (ja) – <a href="http://dogmap.jp/" title="wokamoto" rel="nofollow ugc">wokamoto</a> (plugin author)</li>
<li>Belorussian (be_BY) – <a href="http://pc.de/" title="PC.DE" rel="nofollow ugc">Patricia</a></li>
<li>Dutch (nl_NL) – <a href="http://wpwebshop.com/blog" title="WPWebshop Blog" rel="nofollow ugc">Rene</a></li>
<li>German (de_DE) – <a href="http://www.creditriskmanager.com/" title="Credit Risk Manager" rel="nofollow ugc">Rian Klijn</a></li>
</ul>
If you have translated into your language, please let me know.
<h3>Licence</h3>
Released under the <a href="http://www.gnu.org/copyleft/gpl.html" rel="nofollow ugc">GPL license</a>.

Simple Tweet

This is a plugin creating a new tweet including a URL of new post on your wordpress.

akrabat

The Shorter Links WordPress plugin overrides the default WordPress 
“shortlink” URL with one that has a custom text in it. You can also set a 
different base URL.
A custom field called “Shorter link” is created once a post is saved, 
so that you can change the shortlink to a more memorable set of 
characters.
The choice of base URL to use for the short link can be configured within 
Settings->Shorter Links.
Related Links:
<ul>
<li><a href="http://akrabat.com/shorter-links" rel="nofollow ugc">Plugin home page</a></li>
</ul>
<h3>Licence</h3>
This plugin is licensed under the <a href="http://akrabat.com/license/new-bsd" rel="nofollow ugc">New BSD license</a>.
<h3>History</h3>
2.1.0 – 8 August 2015 
Rework to look for the shorter link after WordPress has done its processing. This 
means that a shorterlink that represents a date won’t affect an archive list.
2.0.6 – 8 August 2015 
Ensure that the short_link is correct when using a post id.
2.0.5 – 8 August 2015 
Updated Tested up to 4.3
2.0.3 – 9 July 2012 
Bug fix so that archives work.
2.0.2 – 23 June 2012 
Fall back to REQUEST_URI if there’s nothing interesting in $query_vars.
2.0.1 – 20 June 2012 
Updated to handle 4 digit short links that look like a year to WordPress.
2.0.0 – 21 November 2010 
Updated to be WordPress 3.0 or above, so we only need to hook into the WordPress 
shortlink system
1.8.2 – 21 November 2010 
Fix permissions issue on settings page. This is the last version that works 
on WordPress 2.9.x or earlier.
1.8.1 – 7 September 2010 
Bug fix to remove a warning.
1.8 – 1 September 2010 
use shortlink rather than shorturl for WordPress less than 3. 
For WordPress 3 or higher, hook into the new shortlink system. 
Fix the admin page so that it displays in WordPress 3.
1.7 – 11 Feburary 2010 
Handle failures better.
1.6 – 10 January 2010 
Update version number in correct places so that the WP plugins system notices the update.
1.5 – 29 December 2009 
Support permalinks that start with /%category%/
1.4 – 14 April 2009 
Support rel=”shorturl” as per <a href="http://sites.google.com/a/snaplog.com/wiki/short_url" rel="nofollow ugc">Robert Spychala’s Short URL Auto-Discovery proposal</a>.
1.3 – 14 April 2009 
Add support for setting the base URL. Patch by <a href="davemastergeneral@gmail.com" rel="nofollow ugc">Dave Marshall</a>.
1.2 – 13 April 2009 
Only send the <code>Link</code> HTTP header as recommended by <a href="http://shiflett.org/blog/2009/apr/a-rev-canonical-http-header" rel="nofollow ugc">Shiflett</a>.
1.1 – 13 April 2009 
Fixed output of HTTP headers. Patch by <a href="http://bethesignal.org/" rel="nofollow ugc">Jeff Waugh</a>.
1.0 – 11 April 2009 
Initial release.

Shorter Links

Override the default WordPress "shortlink" URL with one that has a custom text in it. You can also set a different base URL.

Simple Tweet vs Shorter Links