eu.locklogin:LockLogin-API (maven):  LockLogin is an advanced login plugin, one of the most secure available, with tons of features. It has a lot of customization options to not say almost everything is customizable. Regular updates and one of the bests discord supports ( according to spigotmc reviews ). LockLogin is a plugin always open to new feature requests, and bug reports. More than a plugin, a plugin you can contribute indirectly; A community plugin for the plugin community. 
Keywords: bungeecord|java|login|plugin|security|spigot