Which 3D software for these requirements please?

[ReaderScars]

Hi, can anyone advise on some 3D software please?
I'm on El Capitan and have MeshMixer installed, which I use for viewing supplied STL files.

However I've also been supplied with quite an extensive set of additional files (SLDPRT, SLDASM and BIP) which I'd like to work with myself.

Basically what I'm looking for is a locally-installed (non-cloud) low cost software solution so I can work with the files I've got to make my own arrangements/compositions, rather than create brand new models from new polygons, if that makes sense.

I was thinking about some legacy 3D software, unless there's a cheap, good alternative - any recommendations please?

[ReaderScars]

Thanks Vaud - don't actually need to edit, just want to make my own compositions from the supplied models. Will look into Solidworks, see what's what with the various versions.

[ReaderScars]

OK thanks for the suggestions - have so far installed e-Drawings (opens the files but won't let me make group different assemblies), MeshLab (doesn't open any of the files), Freecad (doesn't open at all). Will probably avoid Solidworks.

Not looking for cloud-based services so Fusion 360 is out unless it can be installed locally?

[ReaderScars]

Insanity Magnet said:

It installs locally on a Windows box but does save to the cloud. There is an offline mode but I haven't explored that.

Thanks for the suggestion but I'm limited to OSX only.

[ReaderScars]

Thanks for the suggestions IM & eps, will try both - would prefer to have a local/offline installation so will try both and see how I get on.