Mods for Minecraft Java
Browse 46 free mods for Minecraft Java — popular picks include BackupGuard, Limit blocks for players, Villera.
Step by step: How to install Minecraft Java mods & modpacks
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BackupGuard
AutoBackup is a high-performance automatic backup system designed specifically for Paper Minecraft servers
Limit blocks for players
Limit itens for players To prevent abusers, such as chunk loaders, entity blocks, etc., which could break the ground, a player can set a limit on the number of blocks a player can place on the ground.
Villera
Turn villages into living economy hubs with biome-adaptive banks and markets, secure currency, rentable chunk claims and performance-friendly stacked spawners
世界存档优化器(自动异步保存)
世界存档优化器,可以自动保存您的服务器世界,采用异步保存。World Archive Optimizer, can automatically save your server world using asynchronous saving. Bukkit 1.21
twinkle popo mod
it adds twinkle popo realistic pikachu and realistic hellokity

Helm
Reduces world loading time by preloading world data in the background
SpeicherSaver
A high-performance Minecraft server plugin that automatically deletes unused world files to reclaim 80%+ disk space while safely protecting player bases and builds.
GuardianCore
Server Moderation, Player Moderation
Toasters Entity Limiter
probably doesn't even work if you can find some way to contact me via Gmail I can get you the source.jar file to fix it. though Id like the fixed version posted by me and ill credit.
PreGen
PreGen is a lightweight PaperMC 1.20.4 plugin that pre-generates world chunks asynchronously in an expanding spiral from spawn, so players don't trigger expensive terrain generation when they explore.