Not exactly the same but there is https://github.com/PrecisionGazeMouse/PrecisionGazeMouse and https://github.com/Versatilus/EyeXMouse.
There might be integrations with https://github.com/dictation-toolbox/Caster but you’d be better off to ask on Caster’s Gitter channel. Even if there isn’t, it wouldn’t be hard to use Caster (or even just https://github.com/dictation-toolbox/dragonfly) to simulate a key-press on a voice command.