Benjamin Kuperberg makes Chataigne, an "Artist-friendly Modular Machine for Art and Technology". Chataigne lets you connect other tools and devices via OSC, like a central hub, and do much much more than that.
Rebecca Fiebrink @RebeccaFiebrink created Wekinator. "It allows anyone to use machine learning to build new musical instruments, gestural game controllers, computer vision or computer listening systems, and more."
Oz @ArtSeeClarke Made Handsfree.js, a pluggable library that lets you add face, hand, and pose tracking to your web projects, and use existing websites hands-free 🙌🏻