HeliCal is a Desktop Utilities software developed by Ecole des Mines de Nantes. After our trial and test, the software is proved to be official, secure and free. Here is the official description for HeliCal:
HeliCal is a Desktop Clock that shows your next Google Calendar events. It allows you to manage Your Time and anticipate your upcoming events much more flexibly than using reminders. HeliCal is particularly useful if you have a busy schedule.