Oh god, talk about good timing. I just got a literal headache spending the last hour searching for a good cross-platform calendar AND todo app that would work on my Mac, and perhaps on Android (although that's bonus). And ideally I'd like to have integration with Trello, so I can schedule my work tasks into the day.
That would be the bee's knees, and improve my productivity noticeably. But alas, such magical software does not exist yet. This is probably the wrong thread as I would pay top dollar for such an app.
The problem with all todo and calendar apps is that nobody has managed to successfully combine the two. A calendar to list only events is of very limited utility if you need a separate app to remind you your todos and tasks for the day.
Yeah, I've tried Fantastical, Todoist, Informant, BusyCal, and a plethora others, but none seem to fit nicely into the workflow of somebody that needs to keep track of their personal and work life without being too strict in their methods.
So for now I'll make do with the basic Calendar app on my OSes, and pen and paper to jot down my reminders as soon as they pop to my mind.