Superpowered - Power through the day without your calendar
Business Calendar - Powerful and easy to use calendar app for Android including weather, widgets and tasks.
Daybridge - A calendar built for people, not companies.
FCorp My Calendar - Manage diary/note, schedule, todo, birthday, etc.
Timeless - A unique clock and calendar visualization
AnCal - AnCal stores yours appointments, tasks and notes, which you can easily add and edit.