We used to already have the Level system, but later we turned it into a paid plugin (for servers only, not for spigot) and removed the level system from the plugin.
But luckily for you guys, we've added it again. It works practically the same as the 'normal' parkours, but now there's a join gui for the levels and more.
All servers that have bought the plugin will get 1/2 of their paid money back.