I’ve never used the online generators, but I have used KnitWare’s shareware pattern generator software for sweaters.
It allows entry of stitch and row gauge, yarn type, etc. as well generating a written pattern, and a place to enter what your pattern stitch is. Also it gives multiple design options on sweater type, necklines, hemlines, etc.
Having only used it for machine knit sweaters, it was quite helpful. Though the graphics are somewhat rough for sweaters you can see what the pieces should roughly look like after knitting for construction.
I loved using it, but alas, it’s only for Windows systems, and I’m leery of using Windows emulators on a Mac. :sad: