This morning I ran across a website where you can design your own circular-yoke sweater. It’s intended to create an Icelandic sweater from Lopi yarn, and allows you to enter sizes and measurements for the sweater, and then design the colorwork patterns for it. Apparently you can then order the appropriate yarn if desired.
It will create a PDF with the schematic, color charts, and knitting instructions.
I see no reason why you couldn’t use it to design a generic sweater with no colorwork if you wanted. There are a bunch of video tutorials to help understand how the software works.
I love Icelandic sweaters, so may definitely give this a try in the future!
The website is: Knittingpatterns.is