BBCode Annotator helps you annotate text so that you don’t need to go through the hassle of typing out the HTML code. For example, if you were to digress from a topic in your post, you can type out an annote and allow the viewers to stay in synch of your topic but at the same time see what extra (and sometimes unneeded) information you added. If you have any annotes in your post, the text will also be added at the end of your post.
Format: 
 [annotate=”hover_over_text” show=”text_seen_in_post“]full_description_of_annote[/annotate] 
 [annote=”hover_over_text” show=”text_seen_in_post“]
The hover_over_text is REQUIRED! The other two aren’t. 
If the text_seen_in_post isn’t depicted, it will use the annote ID (it is automatically generated ID). 
If the full_description_of_annote isn’t depicted, it will use the hover_over_text.

Annotation Plugin

Creates an annotation link to take out "unneeded" text.

Kraken

<h4>Diigo Online Bookmarking Widget</h4>
Display bookmarks from Diigo in your sidebar. Uses <a href="http://www.diigo.com/api_dev/docs" rel="nofollow ugc">Diigo API</a> to fetch the bookmarks.
<ol>
<li>First get an API key from <a href="http://www.diigo.com/api_keys/new/" rel="nofollow ugc">here</a></li>
<li>Use this key along with your username and password in the widget settings. </li>
<li>Then click the “Test API” button to test the api response. </li>
<li>Set widget options. You can mention the ‘User’ input to fetch bookmarks from a particular user or leave it empty to fetch any public bookmark.</li>
</ol>

Annotation Plugin vs Diigo Bookmarks Widget