[inersha]

I have thought about it. Any particularly interesting ones?

[tromp]

Interesting candidates are blake2b, sha-3/keccak, and the much simpler siphash-2-4 that's used in many hashtable implementations.

[rottyguy]

md5/sha1 is useful because they're still used in UUID (rfc 4122) generation. obv not from a crypto standpoint but more from a unique (non-exploited) approach.

[dylkil]

ecdsa would be good