Cachya 2.1.1 was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this software available.
Commonly, this program's installer has the following filenames: Cachya 2.1.exe, Cachya Trial Version 1.0.exe, Cachya Trial Version 2.0.exe and Cachya Trial Version 2.1.exe etc. The most popular version of the Cachya is 2.1. This program is an intellectual property of Cachya Software. We recommend checking the downloaded files with any free antivirus. Cachya lies within Games, more precisely Simulation.
From the developer:
Cachya is real time, 6DOF (Degrees Of Freedom) head tracking software. It analyzes an input video stream, looks for a unique SIGN that can be put on user's hat, and determines head position and movement. There is no requirement for costly or specialized hardware. A regular webcam will provide excellent results!
You may want to check out more software, such as The Grey Wolves Expansion, RailDriver for TRS2004 or Brain Block's 3D Mars Spirit Rover Simulator, which might be similar to Cachya.