I STOPPED THIS PLUGIN As there isn't any reason to turn off online-mode in the newest versions of Minecraft (because of the anti-piracy), I stopped developing this plugin. Someone might want to continue the development, just fork my source and create a new thread Authed - A simple authentication plugin Version: v0.3.1 Description: Since I wasn't able to find any authentication plugins that were either up to date with Bukkit and compatible with multiworld, I made Authed. It is designed to be simple to install and to use. Installation: Put the JAR file in your plugins directory Start/reload your Bukkit server There is no step 3. Features: Easy to use and to setup Uses a YAML file to store the (hashed) passwords Supports multiple worlds Blocks viewing the inventory, breaking or placing blocks and issuing commands JAR file Source code Changelog: Spoiler (Move your mouse to the spoiler area to reveal the content) Show Spoiler Hide Spoiler v0.3.1 - Fixed some NullPointerExceptions when breaking/placing blocks v0.3 - Fixed some stupid errors in the plugin.yml v0.2 - Some code clean-ups - Tried to fix disappearing inventories v0.1 - Plugin release This plugin is NOT bugfree. That's why this is version 0.x I have had experiences with inventories disappearing. Due to a lack of RAM, I am not able to test the plugin on my pc, so I have to wait until my server is empty. I have fixed a bug in the current development version (see source), but this could as well introduce new bugs. I am about to buy more RAM, so expect some improvements in stability soon.