Thank you. The plugin is open source, of course licensed under GPL v3, completely free to download and use. I made it because I wanted to fix the issue of vanilla whitelist not working properly on offline mode servers. It kind of turned into a project to further expand the functionality of whitelist, and future releases are planned to contain various additions, like automatic whitelist purge of inactive players and a way to customize kick message that doesn't require editing language files as it is now (which is not recommended if you don't know what you are doing, really).