I use Pocket Informant (https://market.android.com/details?id=net.webis.pocketinformant&feature=search_result). They are on release 1.0, but if you look at the development of their previous versions, iOS, WM, BB – you know what will be in the future. It offers much more functionality than this CalenGoo. There are a couple of noticable big things missing (Widget for one), but they are aware and working on the next release already.