These Keccak derived hashes are my personal favorite hashes. The Keccak sponge function is a more advanced mathematical foundation of hashing than what we had before. The individual mixing functions were also carefully chosen to do very different things. My favorite attribute, however, is that all the cryptanalysis done on SHA3 maps directly to Keccak (unlike Blake's follow-ons).

Can anyone share real-world examples of where and why one would use these, please?