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Boxy Suite is a suite of beautiful Mac apps for Gmail and Google Calendar. They wrap and completely restyled the webapps, and they feature deep system integration and native features.
Boxy Suite also includes Dashboard, a 100% native status bar app to control and access all your accounts easily.
It's currently buggy and feature lacking, as with most new applications. I would suggest giving this one some time to mature and improve in quality before purchasing it. Judging by Boxy 2 it has good potential for the future.