1.  Shorter Links:
Short URL Plugin allows you to create shorter URL’s and keeps track of how many times a link has been clicked. It’s useful for managing downloads, keeping track of outbound links and for masking URL’s. Clicking the Clear All Clicks button will reset the count for each entry.

You can get Shorter Links plugin from here

2. Pretty Link

You can now shorten links using your own domain name (as opposed to using tinyurl.com, bit.ly, or any other link shrinking service)! In addition to creating clean links, Pretty Link tracks each hit on your URL and provides a full, detailed report of where the hit came from.

You can get Pretty Link plugin from here

3. WP-Chunk

This WordPress plug-in will shorten the URL’s that are present in the comments field. Most of the visitors would like to add or share some other information related to the post in the comments. In that case, they just add the URL of the page that contains the related information. This WordPress plug-in will help shorten the URL’s present in the comments field so that you do not have problem when editing the comments or your blog will look just tidy with all the short URLs.

You can get WP-Chunk plugin form here

4. YOURLS:
YOURLS is a PHP script that will let you run your own URL shortening service in your own domain. And with a plugin, you can link it to your WordPress blog so you can automatically generate short URLs for each post and page you publish. But of course, you need to have a short domain name to begin with otherwise you won’t really get short URLs!

You can get YOURLS plugin form here

5. Short-URL plug-in

This is a user friendly and easy tool for URL shortening. Users are also able to count the number of clicks of the short URL. This counter can be reset with a clear all button. This plug-in also include pagination feature.

You can get Short-URL plugin form here