GitHub - LBPHacker/CasioEmu: An emulator for nX-U8 based Casio fx-es PLUS calculators — maintainer notice: the most advanced fork of this repository is https://github.com/user202729/CasioEmu/, go check it out
fx-ES PLUS Emulator | PRODUCTS | CASIO
How to download Scientific Calculator Emulator for PC [Casio fx-991EX Classwiz - 2020] - YouTube