What is this

A brief perusal of the source code leads me to suspect this is a new competitor for Admin, Admin Menu and so on.

Manager is a set of modules focused on "content manager" users, that is, the users that maintains the content of a site (add nodes, edit, delete, manage comments, etc), but is not admins of the site (don't worry about views, site settings, content types settings, etc).

I'm working on the Manager's Bar, that is really like the Admin Menu (or SimpleMenu, which I love), but much more simple, since this is designed for users that aren't familiar with Drupal. I think that is like the default "Navigation" menu, when we cut off everything that doesn't matter to this users. We are working on less items, so we can focus on direct and most used actions, because it's make users feeling that the site is simpler and easier to manage.

For now, Manager's interface very similar to the Admin, because we want it to be as a complement, not a competitor to it. We are using both in our projects and the result looks quite good.

Perhaps you can paste comment #2 into the project page, to help others with the same question. There are many modules trying to scratch the same 'make the site easy to administer for non-tech users' itch so it really helps if you can see what makes your module different from the rest

Done. Thanks, danillonunes!