OpenSource

OneBody is Open-Source Software. It’s code is readily available for anyone to look at, play with, modify, etc., and it’s development model is just as open. From Wikipedia:

Open source software is computer software for which the human-readable source code is made available under a copyright license (or arrangement such as the public domain) that meets the Open Source Definition. This permits users to use, change, and improve the software, and to redistribute it in modified or unmodified form. It is often developed in a public, collaborative manner.