Genie: A new, fast, and outlier-resistant hierarchical clustering algorithm ('16)
I certainly have a special feeling for non-parametric algorithms. They're kinda fire-and-forget, you plug them in and they work, maybe not as good as with carefully tuned parameters, but you don't need to tune them again and again, which is a big deal.
https://www.gagolewski.com/publications/2016genie.pdf