CloudPIM is a complete personal information manager which lets you safely manage your agenda

CloudPIM is a complete personal information manager which lets you safely manage your agenda, contacts, calendar, lists, notes, ideas, chores, ‘to-do’ items, and much more. It is completely web-based and is accessible anywhere. You can also receive email and text reminders as well as daily and weekly summaries of items on your agenda. With CloudPIM, you can even synchronize your data with your favorite calendar/email clients as well as share it with other members of the CloudPIM community.

I have been using Cloud PIM for about a month and it does everything it says with no problems.