Buff grouping in classic like it does in retail.
 

As the tittle suggests.

Is there an addon for Classic WoW where all the class buffs such as Stamina, Mark of the Wild , Intellect etc. Basically class buffs.

Gets grouped up in one group and show up only on mouse over? I know this is a feature in Retail (Or use to be as I have not played in a long time). So thinking porting should be easy?

Would look like this https://i.imgur.com/OleyPgZ.png

Edit : Looking through some older screenshots this was in WoD https://i.imgur.com/0Kcuh6E.jpg