[CommanderData]

This has been around for a long time. I've used it on projects and been impressed because it's small, naming structure is decent and it contains most things you need.

If I remember correctly it was developed by YooTheme, a company that sells templates for Joomla.

They also had a great plug in that was good for managing user submissions easily with custom fields. I used it at a time where my skills werent as good. The client is still using it AFAIK.