Open-source alternatives to ViaVersion

TShock is a server management tool and plugin framework for dedicated Terraria servers. It functions as an administrative suite and anti-cheat tool designed to control player permissions, monitor game integrity, and extend server functionality. The project provides a framework for creating custom plugins that modify the game world and implement new commands. It enables internal state modification through bytecode injection, packet interception, and memory manipulation to bypass engine restrictions and alter live game environments. Administrative capabilities include a hierarchical role-based

CraftBook is a heavily customizable plugin adding exciting new gameplay elements and advanced redstone functions!

WorldGuard lets you and players guard areas of land against griefers and undesirables, as well as tweak and disable various gameplay features of Minecraft.

CoreProtect is a fast, efficient data logging and anti-griefing tool. Inspect, lookup, rollback, and restore any amount of damage without impacting your server performance.