Running an anarchy server?
Feeling sad that all the popular dupes are patched in the more recent versions of Minecraft?

Bring back the golden age of duplicating items in Minecraft with GoldenDupes!

spigot download page: https://www.spigotmc.org/resources/91474
bstats statistics: https://bstats.org/plugin/bukkit/GoldenDupes/11145

This plugin faithfully recreates famous vanilla duping methods, and adds some simple settings to fine-tune the player experience!

Supported dupes:
minecart nether portal dupe from (1.8)
crafting autocomplete dupe from (1.12.2)
donkey dupe from (1.15.2)
anvil dupe from (1.17)
piston dupe from (1.12.2)

Issues: If you encounter any issues, create an issue. Be sure to be as specific as possible!
(or DM me on discord at Ivan8or#7412, but a response is not guaranteed)

to build from source, download the git repo and run (if on Windows) ./gradlew.bat clean shadowJar (if on Linux/MacOS) ./gradlew clean shadowJar while in the root of the repository.