I am looking for a way to start from a base font and create another font from it, that I could eventually resell. The edits would be rather heavy but the shape could remain.
I would like to know if simple roman fonts with upper and lowercase characters exist in the public domain, or with a licence that would allow me to modify and potentially resell (I would assume that there are right owners that have passed away long ago for their work to be in the public domain, and that their fonts could have been digitized by people with the goal of giving it for free...?)
I have looked on archive.org and also at this question that links to this website (great first step, but it seems a bit outdated and many links are dead), and I am wondering if there are other resources that can be used to find such fonts.
I would assume it could be useful for many people, from design students to font designers that are interested in collaborating on creative projects that share the same base.