Diana K. Cury

Very simple pluing, no configs, no screens, just action! 
Simple Smilies add all WordPress smillies in comments form and a simple javascript let users click them to insert. 
This is a very light plugin, the javascript only loads when in singular/single contexts, also there is no stylesheets.

Simple Smilies

Let users insert WordPress smilies when commenting in you site.

normen

This plugin adds a button bar to buddypress forum posting textfields. 
Features:
<ul>
<li>Insert bold, italic, blockquote etc.</li>
<li>Insert URLs, Images etc</li>
<li>Insert smilies</li>
<li>Buttons can be shown/hidden via javascript</li>
<li>Uses imgur image uploading service to add images to posts</li>
</ul>

BP Post Buttons

Adds a button bar to buddypress forum posting textfields

Simple Smilies vs BP Post Buttons