Eraser
Generate architecture diagrams, ERDs, cloud infrastructure diagrams, and sequence diagrams from natural language or code via DiagramGPT. Supports GitHub sync and a VS Code extension so diagrams stay connected to code. SOC II Type 2 compliant and never trains on user data.
Structurizr
Implements the C4 model as a diagrams-as-code DSL — write Structurizr DSL and render multiple architecture views (Context, Container, Component, Code) from a single model. Version-controlled alongside code with full ADR integration. Free OSS CLI plus paid cloud workspace for team collaboration.