This is probably one of my favorite addons. I spied the idea for its implementation on one of the Java servers back in the second half of the 2000s. It is very functional and intuitive. There is no binding to any area or NPC, which allows you to use it “on the fly” in any situation.
Implementation of a private Buff Shop in the Community Board is the best option due to the size of the latter. It is convenient to select both individual buffs and collect schemes based on them for subsequent use.
This mod supports buffing of pets and summons, which makes it simply indispensable in any situation and style of play. Of course, I had to optimize the HTML code to fit into the maximum page size and for the Community Board. But it was worth it.