Re:TIC-80, a fantasy computer to learn programming
by Nullabillity on Wednesday May 02, 2018 @02:27AM
(#16974586)
From the README:
> For users who can't spend the money, we made it easy to build the pro version from the source code.
So the pro version is still FOSS, their builds are just not gratis.
It's also worth noting that TIC-80 has a $5 "PRO" version; the free (as in no cost) and open source version is basically shareware.