Things To Do is a todo list extension for chrome. it's a free extension , it has 20,000+ active users since released its first version, it earns an average rating of 4.33 from 3 rated user, last update is 268 days ago.
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Very basic -- only lets you create items. No editing or re-ordering of list items. I like that it doesn't require registration like so many other to-do extensions do. Also has a search bar which is hard-coded to use Bing, unfortunately. So, it suffices as a very basic to-do list that doesn't require registration.