First of all, there's a distinct difference between an addon and a 3rd party tool.
An addon for WoW is a set of scripts written in Lua and/or XML that are loaded by the game itself and have limited capabilities sanctioned by Blizzard.
3rd party tools are programs that interface with the game client in ways Blizzard deemed against ToS.
Since WoWInterface is an official Blizzard community site, discussion of 3rd party tools among anything else that violates ToS is forbidden.
Originally Posted by Mimma
You could probably also add a few buttons so you could get the char to cast a buff, a ress or a heal only outside combat.
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Not possible since those are still protected actions. You can set up a button to receive click events from a mouse or keybind, but attempting to run it from something like a chat or addon message event will throw a "call from insecure code" error.