[ankitrgadiya]

A similar tool is https://web.hypothes.is/

[captn3m0]

They also did a historical survey of various such efforts: https://docs.google.com/spreadsheets/d/1f86L7vgHUW9wSLNNSunh....

72 entries.

[olav]

I use Hypothesis a lot. It works on arbitrary sites by just invoking their javascript bookmarklet which I keep in my bookmarks. It is also very easy to integrate with static sites which is nice.