This is one of the best tools you will find, which enables you to organize things. For example, your events, meetings, appointments, trips, work schedules, ect.
It also has custom tools function, which enables people to make their own tools and add it to the interface. So there are many tools made by other people for your own use. Here i have added next meeting tool, which shows how much time left for the next meeting.
The other thing is the notification function. You can set notifications to be sent certain time prior to the event. Or if you have google chrome intalled and if you have enabled the calendar plugin, you will be notified with a pop-up. Sms notification is available for some countries only.