JustAuth

Why you should download this auth plugin

Forces players to register and log in before interacting
Easy to use and highly configurable
Supports hex and &0-9 &a-f color codes
Secure passwords hashed with bcrypt
Supports aliases like /l and /reg

Commands

/register <password> - Register a new account
/login <password> - Login to your account
/changepass <old> <new> - Change your password