Philip John

This plugins adds a visible link to the end of every post.
Best used in conjunction with the <a href="https://wordpress.org/extend/plugins/googl-shortlinks/" rel="ugc">Goo.gl Shortlinks</a> or <a href="https://wordpress.org/extend/plugins/bitly-shortlinks/" rel="ugc">Bit.ly Shortlinks</a> plugins.
Feature requests welcomed with open arms!

Add Shortlink to Posts

Adds a link to the shortlink for each post below the content.

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.

Add Shortlink to Posts vs tokpw Short URLs