Welcome to possibly, the most amazing site on Earth!
This site distributes the two godly .jars possibly known as Craftbukkit, and Spigot. That other one Cauldron, that ain't godly enough, but anyway, this site allowed you to get these amazing plugins at a good price, that price being that I won't care, or complain that you want it so badly! You see, I believe that open source stuff that is copyrighted is a stupid idea, and that maybe people should think twice about how their code would be forked and borrowed and copied and pasted and fixed and improved on before hitting that commit button. So here are downloads right here, step right up!