Code, text, or UI?
Structurizr is a collection of tooling to create software architecture diagrams and documentation based upon the C4 model.
Designed for the C4 model
Structurizr was specifically designed to support the C4 model for visualising software architecture.
Document your cloud architecture
Use themes to help document your cloud architecture; with prebuilt themes for Amazon Web Services, Microsoft Azure, Google Cloud Platform, Oracle Cloud Infrastructure, and Kubernetes. See Help - Themes for more details.