itscwf

FYI-GO URL Shortener automatically shortens URLs in your WordPress posts and pages using the FYI-GO API. Save time and keep your links clean and trackable.
<ul>
<li>Automatically shortens URLs in your content (inside anchor links with an href)</li>
<li>Bulk conversion tool for existing posts</li>
<li>Choose a default “Box” for organizing your short links</li>
<li>Easy API key setup from your FYI-GO account</li>
</ul>
<h3>External services</h3>
This plugin connects to the FYI-GO API service to create, manage, and retrieve shortened URLs.
The plugin sends the original URL to the FYI-GO API when a user creates or automatically generates a shortened link. If API credentials are configured, the plugin may also send the configured API key and secret to authenticate the request.
The external service is provided by FYI-GO: 
Terms of Service: https://website.fyi-go.com/terms 
Privacy Policy: https://website.fyi-go.com/privacy 
API documentation: https://api.fyi-go.com/info
<h3>License</h3>
This plugin is licensed under the GPLv2 or later.

FYI-GO URL Shortener

Plugin maintained by FYI-GO to shorten URLs in your WordPress posts and pages using the FYI-GO API. It is not a WordPress core product.

k0nsl

This plugin creates a short URL from the blog post permalink and stores it in the database. The URL is displayed below the blog post along with a link to twitter that passes the short URL on, if defined in the settings page. The plugin currently use knsl.net as the only service and stores the data in the database of knsl.net.
Plugin homepage: http://k0nsl.org/blog/k0nsl-short-urls-plugin/
For support use WordPress.org or devNET community forums: http://devnet-software.org/
Thanks!

k0nsl Short URLs

Automatically shortens the blog post URL via knsl.net.

FYI-GO URL Shortener vs k0nsl Short URLs