The Spacelift module registry provides a private Terraform module registry that is fully compatible with Terraform. It allows users to define reusable Terraform modules and share them with various different audiences, including sharing modules with multiple Stacks in their Spacelift account but also includes sharing modules with other accounts. The module registry is available to all Spacelift accounts regardless of tier, although certain functionality, like the ability to share modules with other Spacelift accounts, is only available on the Enterprise tier.