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Re:Ask HN: What is the most interesting FOSS that most peopl... by brudgers on Tuesday September 07, 2021 @01:11AM (#28441164)
BRL Cad, but it is public domain not FOSS.

https://brlcad.org/

Re:Ask HN: What is the most interesting FOSS that most peopl... by mattplm on Tuesday September 07, 2021 @01:52AM (#28441369)
Most of the code is under the LGPL license, not in the public domain. The build files are under BSD and/or public domain and BDL and/or public domain for documentation. FWIW being in the public domain with sources available is considered free according to the FSF (not the OSI apparently).