ZooKeeper is a TBC/WotLK AddOn. It can be used to overcome the ignore list size limitation or simply as another way to mute players, the whole with gorilla sound effects.
You can capture/release apes from the target frame, the chat frame and the Ape List accessible on Social (Friends tab). More settings will be added later.
- Click on the green button "Clone or download"
- Select Download ZIP
- Extract this .zip file under 'Your_WoW_Directory\Interface\AddOns\'
- Remove the "-master" from the folder name