There are actually a few open source SPARC implementations, including the first two Niagra revisions. https://en.wikipedia.org/wiki/SPARC#Open_source_implement

There are actually a few open source SPARC implementations, including the first two Niagra revisions. https://en.wikipedia.org/wiki/SPARC#Open_source_implementations https://en.wikipedia.org/wiki/SPARC#Open_source_implementati...