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Marlin
Marlin is an optimized firmware for RepRap 3D printers based on the Arduino platform. | Many commercial 3D printers come with Marlin installed. Check with your vendor if you need source code for your specific machine. (by just-trey)
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just-trey has a marlin build for the 2/2S that is supposed to be good, although I haven’t used it personally. https://github.com/just-trey/Marlin/blob/elegoo-neptune-2/config/Elegoo/Neptune-2/README.md
Then for the configuration file, just-trey has a pre-made one for the Neptune 2/2S https://github.com/just-trey/klipper/blob/master/config/printer-elegoo-neptune2-2021.cfg He also has a fork of klipper but I suggest just using the official build via KIAUH as shown in that video.