If you just care about the resume, then write on your resume: “have experience in doing this sort of stuff.” Recruiters aren’t going to look into GitHub to study your code.
If you care about getting the code used or sold, I’d first consider finding the next potential client to make use of whatever the program does. Their need will likely be different, so you’ll need to rewrite it anyway. You then have both the client and a new product on your hands.
Link is broken.