Efficient Calendar is a System Utilities software developed by Efficient Software. After our trial and test, the software was found to be official, secure and free. Here is the official description for Efficient Calendar:
Efficient Calendar is an elegant and easy-to-use scheduler, planner and reminder. Multiple calendar views, such as Day, Week, Month and Year views as well as list view are available so you can better arrange and track your events. By setting subtasks at any level, you can better organize and manage the to-do list. All appointments, meetings, events and tasks can be reminded in time as configured, and you will never miss any important event! you can download Efficient Calendar free now.