Click to Focus, Focus Follows Pointer, Sloppy Focus.
All useful. But sometimes what I want is eye-tracking and Focus Follows Gaze 
if you don't need it to be a Product and don't mind using Windows, you can get there on €170 (Tobii 4C) and a few days of coding (source: I work on this)
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however you will probably find it surprising how often you don't want the focus to follow your gaze, or how distracting that is (especially with overlapping windows)
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Yeah, I expect it to behave pretty badly. But sometimes it feels like what you want :)
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Tobii 4c owner here -- fwiw on linux I was able to hack this together with wmp from wmutils about a year ago. Turned out not to like it as well as I thought :P, but was fun to poke at.
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I assume this was with the streamengine linux drivers? I tried those once but didn't get them to work, but it probably would've worked given another distro.
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