What are /r/GoogleCalendar's favorite Products & Services?

From 3.5 billion Reddit comments

Business Calendar 2

I use the paid version so I unfortunately don't know what the free one allows. I can confirm this can elegantly and fully interact with Tasks from multiple connected accounts. One minor issue is that you have to activate and allow task-management separately (additionally) after your regular calendar stuff (that's just the answer to "why don't I see my tasks, even though i setup my calendar already?!").