This is a discussion topic for the Ore project, SQL WhiteList. View the full project on Ore for downloads and more information.
an simple whitelist plugin who use database as “whitelist”, its good when you have an network (multiple server) and wish an whitelist on all,
The plugin is ultra light 5kb, and also doesn’t stress sql server, because the connection and query are made only when player join.
I maded a demo website for you that can be found there: https://github.com/fmohican/SQLWhiteList-WEB