The difference between HyperWorks, Nastran, Abaqus and Ansys

Hypermesh is just the pre-processing, Radioos is the HM Solver, is also very powerful to deal with many nonlinear problems, the most important is the HM Optimization function is powerful. Better than those few.
Abaqus is suitable for nonlinear analysis, especially for contact analysis.
Nastran has a large market in linear structure analysis, for example, many aircraft design institutes are using Nastran for analysis or standard.
Ansys should be the boss of the finite element industry, which buys a lot of solvers to expand its range of use, such as fluent and Ls-dyna. This allows Ansys to handle shock and fluid problems.
Many people think that Dyna the Ansys acquisition, in fact, not, Ansys seems to have just bought Dyna solver.

The difference between HyperWorks, Nastran, Abaqus and Ansys