MCPig
This server plugin will allow you to know whenever someone is joining your game, It will say "(username) has connected!", even If they are banned, you will always know when they are trying to connect.
This is my first server mod, and I will be hoping to make much more in the future.
Yes, I will be adding to this plugin and making it a very useful administrative tool, up to now, It has one purpose, to tell you when someone connects, but fails.
If you have any ideas of what you would like to see, please leave me a message below!