Habitat’s core-plans is the central repository for packages/plans maintained by a group of volunteers. These plans form the basis of pretty much everything built with Habitat. From low level libraries and tools such as GCC, glibc, openssl to high level applications like Jenkins, Artifactory, and a whole range of others. The full list can be seen in the Github repository. Theres a bunch of things that happens behind the scenes of your pull request on the Habitat core-plans repository.