I've made the multi-platform (PC/Linux/Mac) multi-platform (ZX Spectrum, C64, Plus4, Amstrad CPC, MSX, Sinclair QL, Atari ST, Amiga, VIC-20) paint program called Multipaint. The first release was 2016, and the newest version is Multipaint 2023.
Go on, pick your mouse, preferably two-button, wheeled, and start pixeling!
For more information, download and an image gallery, check the home at:
Multipaint 2023 at Commodore Scene Database:
Oldmachinery blog posts about Multipaint releases: