There's a forum post from a few years ago [0] with a few links to projects; I don't know how active they are though. One of them [1] is an array of treadmill

There's a forum post from a few years ago [0] with a few links to projects; I don't know how active they are though. One of them [1] is an array of treadmills running in one dimension, mounted on a track that moves them in the perpendicular direction, and it tracks your movement to keep you near the centre of the platform. Another [2] holds you in place while you run with slippery shoes inside a saucer-shaped surface. [0] https://forums.oculus.com/community/discussion/388/2d-treadmill-list https://forums.oculus.com/community/discussion/388/2d-treadm... [1] http://spectrum.ieee.org/automaton/robotics/robotics-software/cyberwalk-giant-omnidirectional-treadmill-to-explore-virtual-worlds http://spectrum.ieee.org/automaton/robotics/robotics-softwar... [2] http://arstechnica.com/gadgets/2015/01/the-virtuix-omni-vr-treadmill-made-us-all-hot-and-sweaty/ http://arstechnica.com/gadgets/2015/01/the-virtuix-omni-vr-t...