ManageWP Worker plugin allows you to remotely manage your WordPress sites from one dashboard.
Despite saying the plugin software is free, it is only a two week trial. After that, you have to pay for a minimum of 5 sites, even if you only have 1.
I was impressed with all the features of ManageWP, and it would be an excellent premium plugin for anyone managing several sites, so I'll give it 2 stars, instead of 1. It is overkill and too expensive for us little guys, and frankly, should not be in a "free" plugin repository, as the functionality of the free version is almost nil.