This blog post reviews 10 of them. Most of them seem to be for iOS, but there are some that can also be used on Android devices. Although I have tried many calendar apps the only one I have really, seriously, use is Google Calendar, both on my PC and my Samsung Galaxy tab. My only problem was that my day’s schedule is not tied to “events”. My work habit is more of a “to-do” type; you create list of things that you need to do, and then you tick off as a complete them. There is nothing like at 10 o’clock I need to call up someone, at 1:30 I need to go to lunch, and so on. This is why Wunderlist seems good to me. Although there is Google Tasks but looks wise I find Wunderlist better.
Amrit Hallan is the founder of TechBakBak.com. He writes about technology not because "he loves to write about technology", he actually believes that it makes the world a better place. On Twitter you can follow him at @amrithallan