Extensions that start with the letter T, require jQuery for the Control Panel, are Free and are sorted alphabetically by Title.
ExpressionEngine 1.x, ExpressionEngine 2
Uses textile and a WYSIWYG editor to output 100% valid code - easily customizable to add your own buttons as well.
This is a very simple extension that adds links to the edit and publish pages that expand or collapse all fields.
Trace changes to your local-dev Expression Engine database into release files and publish them to your live site.
Adds a button which easily lets you retweet your blog posts. A port of the official TweetMeme Wordpress plugin.