Login Me In V6:
You can choose between save data on MySQL or players.yml in config.yml
It is compatible with servers using 1.7 and 1.8

Protects:
Inventories, Dropping Items, Chat, Commands,
Taking Damage, Breaking Placing or Using Blocks

INSTALL INFO:
unzip the files inside the plugin folder.
check that login.jar is inside the plugin folder
and a folder named LoginMeIn is also inside
the plugin folder
start the server

Commands:
/register password
/login password
/unregister player password
/changepass player oldpassword newpassword
/setemail email@here.com
/forgotpass

IMPORTANT:
1. you need to create a gmail account and activate this option
https://www.google.com/settings/security/lesssecureapps
in that account so the plugin can send emails from that account
to players, set the gmail account on config.yml.

WEB Stuff
this is a basic web stuff for the mysql login system
information to connect to mysql database
http://dev.bukkit.org/bukkit-plugins/loginmein/pages/connect-php/
the top of the webpage
http://dev.bukkit.org/bukkit-plugins/loginmein/pages/header-php/
the signin from users registered by web or minecraft
http://dev.bukkit.org/bukkit-plugins/loginmein/pages/signin-php/
register users from web and they will be registered in minecraft
http://dev.bukkit.org/bukkit-plugins/loginmein/pages/signup-php/
see the players registered on the server
http://dev.bukkit.org/bukkit-plugins/loginmein/pages/users-php/

Source Code:
https://github.com/raton023/logmein

Loginmein