Checker Plus for Google Calendar adds events by clicking on any day in the popup calendar or with "Quick Add", desktop notifications "like Outlook" when your event occurs that you can snooze, and voice notification. You can add a cooking timer that yells out "take out pizza". It supports multiple Google Calendars and Google Apps Calendars. Checker Plus for Google Calendar popup a calendar for the month, week, or agenda view when clicking on the icon. Get reminders of your contacts' birthdays and events and lots of options that you can customize.
||Google Chrome browser