Douglas Wilder, Ultimate Renumber Utility Douglas Wilder published one program though Atari Program Exchange, Ultimate Renumber Utility, which he co-wrote with his father, Justin Wilder. It first appeared in the winter 1981 APX catalog, but was featured in the catalog for less than a year: in the winter 1982 catalog, it was replaced by BASIC/XA, which did renumbering as well as other functions for programmers. This interview took place on January 26, 2018. Teaser quote: "So we got enough money off the sales of that through APX that it paid for both my father's computer and mine."
Ultimate Renumber Utility in the winter 1981 APX catalog
ANTIC The Atari 8-bit Podcast