From the developer: "The NVIDIA 3D Stereo Driver, when used with compatible hardware, allows full-screen stereo viewing of many Direct3D or OpenGL based games. No other stereoscopic driver software is required.
"When 3D games are played and the driver is enabled, the driver converts the image to 3D stereo and displays it on the screen. You can set up the driver to use either the page flipping or anaglyph method of stereo imaging. With compatible viewing hardware, you'll see the image with the perception of depth."
Note: NVIDIA 3D Stereo software is the driver for use with NVIDIA 3D Certified Display products. Download this driver only if you are not using a 3D Stereo product.
Here's other similar drivers that are different versions or releases for different operating systems: