Papier[0] for my daily checklists. It's convenient because, as a web developer, I spend all my time in chrome.

I'm still working out a system for managing longer term checklists/goals/plans/etc. To that end, Natrium[0] (which I just found out about in this thread) looks interesting.

I'm also still working out a system for managing activity-based checklists for processes like checkins, code reviews, etc.

[0]: https://chrome.google.com/webstore/detail/papier/hhjeaokafpl...

[1]: https://natriumapp.com/