Josh Betz

Changes the Short URL and the Twitter Tools URL for each post on your site using a custom, shortened domain and a base-36 encode of the post ID.

JB Shortener

Changes the Short URL and the Twitter Tools URL for each post on your site using a custom, shortened domain and a base-36 encode of the post ID.

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.

JB Shortener vs Add Shortlink to Posts