What's your favorite to do list?

There are so many to do lists apps out there. Which one can't you live without?
1
Moo.do

Ridiculously simple, incredibly powerful organization

Jason CrawfordCo-founder & CEO, Fieldbook · Written
It's just text—super-lightweight. But it gives you hierarchy and priorities, and you can collapse groups, drill into groups, or filter by priority. Also has email integration
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