Google+ is ever-so-slowly opening up its API to more and more developers. There's still plenty to be done in this department, but Google has announced that it will enable more developers to use the management APIs which should enable users to manage their Google+ presence from a tool they're familiar with and they already use for Facebook, Twitter and so on.
Google has been road testing the management APIs with a number of developers. Companies like Buddy Media, Context Optional, Hearsay Social, HootSuite, Involver and Vitrue have had access to the APIs for several months now.
But Google is opening
up and will accept more developers in time. There will still only be "hundreds" of new developers allowed, but there probably aren't that many more out there that care about the feature.
The thing to take away from this, as a regular users, is that you'll be able to connect to Google+ and interact with the social network without visiting the site.