If you are hunting for a new calendar app then Sunrise Calendar is well worth a look. The first thing you will want to know about Sunrise Calendar is that it is compatible with Google Calendar, iCloud and Microsoft Exchange on the iPhone, where it's been around for a while, and with Google Calendar and iCloud on Android where it is new – with Exchange coming soon.
Sunrise Calendar is a very different kind of calendar experience and one which can put your social data right in your schedule, and which offers a lot of different types of views so that getting to the information you need is easy. So, for example, you can see who you are meeting up with thanks to a LinkedIn connection, and can drag in Facebook events and birthdays easily. Location-based weather info is at your fingertips too. Management of events is easy and multiple Google Calendars are supported.
Of course there's a web-based app, too; see: https://calendar.sunrise.am.
Product: Sunrise Calendar
OS: Android, iOS