HFC family sustainable algorithms can be implemented in a variety of ways, either using multi-population structure or using the single population with some special mechanisms to control the distribution of individuals of continuous fitness levels. The following are some of these implmentations.

HFC-GP: based on lil-GP with adaptive topology and adaptive thresholds (to be uploaded soon)

Open-beagle 2.1.4 provides one genre of implementation of multi-population HFC evolutionary algorithm.