The more words an open source tool devotes to the alternatives, the better engineered it tends to be IME. From Uber's article about their method profiler:
miniblog.
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How do you tell if a computer game is being played by a human or a computer?
Trackmania allows you to replay every keystroke. Enthusiasts have reverse engineered the game and measured what the fastest possible inputs are possible by hand!
Facebook's warning against socially-engineered XSS is neat. It's a shame it's necessary though.
