I am looking to find the most powerful software for designing the aluminum structural framing systems. The library of software which has the aluminum profiles is preferred. your suggestions will be appreciated.
It all depends on your application: Is it a civil engineering structure of a mechanical/aeronautical engineering one? Also, how accurate you want your models to be.
For the civil engineering, I find CSI / SAP2000 rather good.
For a Mechanical engineering application, NX/Nastran (SimCenter 3D) is hard to beat.