I was wondering the same thing yesterday. Searching around only returned me smartphone apps that connect to Google Calendar, with a couple of actual alternativ

I was wondering the same thing yesterday. Searching around only returned me smartphone apps that connect to Google Calendar, with a couple of actual alternatives (Zoho, which I'm using as a primary email provider and can't set the freaking timezone right, and Outlook calendar, where I absolutely despise its web design). It's like nobody's even trying to implement this properly. I'm trying out Yahoo's calendar now.