netgen 6.2.2006+really6.2.1905+dfsg-5.1build1 (riscv64 binary) in ubuntu mantic

 NETGEN is an automatic 3d tetrahedral mesh generator. It accepts
 input from constructive solid geometry (CSG) or boundary
 representation (BRep) from STL file format. NETGEN contains modules
 for mesh optimization and hierarchical mesh refinement.