These mods return numerous things from the old days of Minecraft Java Edition that were removed. NBXlite is a fork of InsanityBringer's NoBiomesX (also known as "The Nostalgia Project", feel free to check out the original post here: https://www.minecraftforum.net/forums/mapping-and-modding-java-edition/minecraft-mods/1275124-1-0-0-no-biomes-x-very-dead-use-exalms-stuff)
SSPC is a fork of simo_415's Single Player Commands 3.2.2. Everything in src/client/spc, bin/spc-* and bin-old/spc-* is licenced under GNU LGPLv3.
Of course, this repository is also the home of 'OldDays Revisited', which is primarily a fork of NBXlite designed to improve the noise generation. Even though the logo effect randomizer and a small portion of the Indev mob AI have been altered, those differences are rather insignificant.
I'm just a random individual who wanted to archive these mods so they wouldn't be lost. If you want to set this up for whatever reason, then here's how ya' do it:
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Download MCP. But don't worry my dear lad! Because someone has archived every official release of MCP here: https://archive.org/details/minecraftcoderpack
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Decompile the client using MCP.
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Clone this repository to src-mods directory.
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Go to src-mods/build and run deploy.sh script. (Or deploy.bat if you use Windows)
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It is ready. You may now recompile the client and start it.
To build a release, run make.sh script in the MCP directory. Not from src-mods/build! Resulting zips will be in reobf/result2.
build/ln.exe source code can be found here: https://github.com/neosmart/ln-win
Some clever lad supposedly fixed this source code. So if you're a Java developer, please use his source code instead: https://github.com/Spyro201/Minecraft-mods