PiVR: Virtual Reality for Small Animals (2019)
The Raspberry Pi based Virtual Reality system (PiVR) is a virtual reality system for small animals (link to publication) that has been featured in Scientific American. The code is open source (BSD license), the source code for all the PiVR software can be found on Gitlab, and you can also find a Bug Tracker on Gitlab.
For a guide of setting up your own PiVR, please visit www.pivr.org