"Ondřej [Certik] is the original author of SymPy, SymEngine and LFortran".
https://www.sympy.org/en/index.html
https://lfortran.org/ << "Modern interactive LLVM-based Fortran compiler"
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Raise your hand if you first encountered Fortran in (eng) school and wrote your first Fortran programs on punch cards. (MTS for bonus).