S-Planner & Google Calendar
For calendar, I never realized that I will like Samsung’s S-Planner. I like it because it displays list of appointments in month view. Google Calendar, despite its simplicity, just shows color bars. I have to tap on the date in order to see the actual appointments. (Apple’s Calendar.app does that too.)
I still use Mac OS X and iOS devices as regular companions so I use BusyCal to sync between iCloud and Google Calendar.