So I don't know if any tools/frameworks exist for this but it sounds doable enough to roll your own!
Assuming you have a web app that can receive requests and some kind of data database (or other data store), I think it might be something like this.
Create a todo-list model (or add a column to your existing model) that can store some kind of UUID private identifier. Since this would be a UUID, it should be unique to every record, and private for this use case.
Then generate a link with that UUID, maybe something like mytodolistapp.com/todos/:UUID:
that looks up the correct todo list by that UUID. Then this page would be responsible for editing the ToDo list. Importantly this page should NOT authenticate the User, as you want them to have access without logging in.
Basically I think you need some sort of secret random identifier that can be used to look up the todo list. Then Users can distribute this identifier and anyone who knows the id can edit the list!
Hope this helps!
Awesome, this did help quite a bit! It definitely helped me conceptualize some things in my mind.
We're a place where coders share, stay up-to-date and grow their careers.
We strive for transparency and don't collect excess data.