In our lab we had a stereoscopic projection system (via two projectors and polarizing filters). It was impressive at a time when 3D TVs and projectors practically didn’t exist yet. I developed OpenGL applications that work in stereo for visualizing the SOM layouts from the SOM algorithms. This enhanced the readability of the visualizations when the screen becomes cluttered with numerous objects. I also made stereo images with POV-Ray and converted them into videos.
I made a custom stereo video player that read files in the Matroska container format (which was the first that allowed storing stereo video) and would display this video on our projection system while maintaining sync. This was used when some visualizations required offline rendering.