ExtensionsCodeMirror
As a developer, I like to write my articles using HTML code and I was doing this on a plain textarea until I found CodeMirror. It's a great JavaScript based editor and it supports a wide variety of languages (HTML, CSS, PHP etc.) This plugin for Joomla! brings this great program to your site.
Kudos for Marijn Haverbeke for releasing such great code as a free software
Title Manager
With this plugin, you can display your site name in page titles. It’s able to display the site name before or after the content title and use a custom separator. You can specify a different name to use in title, if you want.
Columnists
This extension allows you to choose some users from your site and show their latest articles in a module.
Author Details
This plugin shows user details and other articles based on the creator of the current article. It's using a template based approach.