A spack stack can be thought of as a packaged set of packages to install alongside a configuration. They are typically represented in a file called `spack.yaml`. Thus, with the magic of the GitHub API, we can look for these configuration files across GitHub and present a set to you here. This is the spack stack catalog. How are spack.yaml files and repositories tagged for inclusion? The catalog includes stacks based on the following criteria:

• The stack is contained in a public Github repository.
• The repository has one or more spack.yaml files.
• The repository is small enough to be cloned into a Github actions job.
• The repository is not blacklisted here.