Extensions that start with the letter D, require jQuery for the Control Panel, are Free and are sorted by Page Views (descending).
dashEE is fully customizable ExpressionEngine control panel dashboard alternative.
Deviant allows you to control, globally or on a per-channel basis, where authors land after publishing, updating or deleting entries in the EE control panel. An essential extension for every EE install.
Makes the ExpressionEngine template editor read-only for templates under source control.
Disable Default Memberfields (ddmf) is a module that disables the default memberfields like (ICQ, Yahoo IM etc) in the CP of ExpressionEngine.
Disables the EE1 template editor for users to control templates via source control. This prevents users from creating out of sync issues between the server and repo.