netgen-doc 6.2.1804+dfsg1-3build2 (amd64 binary) in ubuntu focal

 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.
 .
 This package contains the user manual (in PDF format) and example
 files.