Week Calendar for iPhone - Week Calendar is a powerful calendar app for people with a busy schedule.
Its user-friendly interface allows you to view your appointments at a glance using a day, week, month or year level overview
Horizon Calendar - Horizon Calendar is a useful calendar app which integrates weather forecasts. This way you can conveniently see how the weather will be on the date of a scheduled event.
Horizon Calendar can show forecasts for up to 14 days, presented on a smart list that emphasizes the current day
CircleTime - CircleTime is a revolutionary calendar which brings a completely new understanding of time. Instead of the established linear perception of time in which the days keep going by, the new calendar enables a unique display of time periods in an orbit, on which you can, by turning it, travel forwards or backwards in time.
The new calendar is simple
Fantastical - Fantastical is a fast calendar app for iPhone, iPad and iPod touch. It uses advanced natural language processing algorithms that allow you to quickly add new events. You can, for example, type in or speak "Meeting with investors on Monday" and the app will schedule it
Pocket Informant Pro (iPhone/iPad) - Pocket Informant is an integrated calendaring and GTD-based tasks solution for the iPad. Our purpose is to fuse together best-of-class calendaring with best-of-class tasks into one great solution
Calendars+ by Readdle - Calendars is an elegant and easy to use calendar application which works perfectly with Google Calendar and the built-in iOS Calendar.
Calendars lets you manage events both online and offline