http://en.wikipedia.org/wiki/LEON http://en.wikipedia.org/wiki/LEON http://space.stackexchange.com/questions/729/why-did-the-esa-choose-sparc-for-leon http://s

http://en.wikipedia.org/wiki/LEON http://en.wikipedia.org/wiki/LEON http://space.stackexchange.com/questions/729/why-did-the-esa-choose-sparc-for-leon http://space.stackexchange.com/questions/729/why-did-the-esa... The SPARC ISA is completely unencumbered as far as I know, and there are several copyleft implementations of the architecture that are synthesized into interesting products, often from overseas vendors (for example Navspark: https://www.indiegogo.com/projects/navspark-arduino-compatible-with-gps-gnss-receiver#home https://www.indiegogo.com/projects/navspark-arduino-compatib... )