fiskeben

Adds a link to each post that points the user to Twitter.com. Before the redirect, the URL for the actual post is sent to Tinyurl.com and the tinyurl-ified URL is used as an argument to Twitter.com thus putting it in the status field when the page loads.

FishyTweet

Adds a "Tweet this" link to posts, shortens URLs with tr.im or TinyURL and sends the user to Twitter.com.

netandreus

This plugin adds ability to create short URL from the blog post permalink and stores it in the database. The plugin currently use tok.pw as the only service and stores the data in the database of tok.pw.
Plugin homepage: http://tokarchuk.ru/2013/03/tok-pw/
For support use WordPress.org or this page: http://tokarchuk.ru/2013/03/tok-pw/
Thanks!

tokpw Short URLs

Automatically shortens the blog post URL via tok.pw.

FishyTweet vs tokpw Short URLs