A non exhaustive list of projects to be known to have rather unpleasant vibes.
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Yatopia, "The combined power of Paper forks for maximum instability and unmaintainablity!" - Messy, tossed salad of people that haven't even really understood the patch system.
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SkinsRestorer, "
System.out.println("[SkinsRestorer] "),try {} catch (Exception e) {}" - The cleanest code it has comes from one-time contributors. -
FlameCord, "Are you sick of using sane, open-source software? Try this mcmarket Travertine fork!" - While it has some nice workarounds to vulnerabilities, it's done on the wrong layer and contains some rather weird changes as well.
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EntityTrackerFixer, "Minecraft tracks alot of entities - so lets disable that, who needs entities to work as intended anyway ;^)" - If this does fix your issues, you are certainly doing something wrong.
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Literally any closed-source (paid) 1.8 Paper fork on mcmarket, "[Optimized] [Cannons] [Everything is multithreaded]" - Mostly just copied off each other with little to no actual work involved or improvements done, with many even introducing major bugs or including security breaches.
This list does not mean you must not use any of the above mentioned, but just that some random person on the internet considers some of their design choices questionable. Have a nice day, k thx bai.