Eternity is esolang concepted by user:Jabutosama. It could be maybe one of the most useful languages in the world, but has one meaningless problem which makes it just useless.
It has clear, robust and beautiful syntax:
World Of Warcraft Copy
The language has nearly infinite applications in all fields where computer science reaches its wings. It is only a shame that it is not so widely known. A subtle note is that every program takes infinite time to compute.