Jim Knopf, nicknamed Jim Button ("Knopf" meaning "button" in German) (October 20, 1942 – October 1, 2013[1]), was considered by many to be one of the "fathers" of shareware (so named by fellow software veteran Peter Norton).
He released his first program, PC-File (a flat file database), in late 1982 as "user supported software".
He has been quoted as saying this expression not only reflected the optional payment model, but also that comments from users drove the development of later releases.
He collaborated with PC-Talk (communications software) developer Andrew Fluegelman to adopt similar names (PC-File was originally "Easy-File"), and prices, for their initial shareware offerings; they also agreed to mention each other's products in their program's documentation.
A few months later (early 1983), Bob Wallace followed suit, coining the term "shareware" for his similarly marketed product, PC-Write, a word processor.