All of the hardware design and software I produce for retrocomputing is open source and given unencumbered license. I don't make any profit from those selling my boards like the 32k sideport RAM or TIPI storage solution for the TI-99/4A. I do however, continue to fix and improve the software side of those products, as well as build other tools like ForceCommand to help get the most out of them. If you like that work, consider a donation. A little appreciation goes a long way toward motivation.