Other memory-hard KDFs

Aside from some historical ones and bcrypt (which did not use more than a few KB), there appears to be only slothKdf (and its zen32 component) by Elias Yarrkov
Only released as part of dhbitty program, may change
Not peer-reviewed
Uses the memory bus poorly (32-bit random accesses)
Provides advantage to attackers with custom hardware
Bumps into the memory bandwidth
A revision of zen32 with cache line sized accesses may use more RAM than scrypt (same duration)