Plugin

A Minecraft Map Editor... that runs in-game! With selections, schematics, copy and paste, brushes, and scripting. Use it in creative, or use it temporarily in survival.

A permissions plugin/mod for Minecraft servers.

A bridge/proxy allowing you to connect to Minecraft: Java Edition servers with Minecraft: Bedrock Edition.

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

The essential plugin suite for Paper and Spigot servers.

A bukkit plugin for manipulating player inventories.

A shop plugin that allows players to easily sell/buy any items from a chest without any commands.

Make yourself completely invisible with /vanish

Physical economy for Vault