Structurizr builds upon "diagrams as code", allowing you to create multiple software architecture diagrams from a single model. There are a number of tools for creating Structurizr compatible workspaces, with the Structurizr DSL being the recommended option for most teams. This Structurizr DSL example creates two diagrams, based upon a single set of elements and relationships.

• Structurizr CLI @ GitHub.
• Structurizr documentation.
• Structurizr Lite @ GitHub.

NetBox is the leading solution for modeling and documenting modern networks. By combining the traditional disciplines of IP address management (IPAM) and datacenter infrastructure management (DCIM) with powerful APIs and extensions, NetBox provides the ideal "source of truth" to power network automation. Available as open source software under the Apache 2.0 license, NetBox serves as the cornerstone for network automation in thousands of organizations.

NetBox is the source of truth for everything on your network, from physical components like power systems and cabling to virtual assets like IP addresses and VLANs. Network automation and monitoring tools draw from this authoritative plan to push out configurations and monitor changes across the enterprise.

NetBox @ GitHub

D2 is a diagram scripting language that turns text to diagrams. It stands for Declarative Diagramming. Declarative, as in, you describe what you want diagrammed, it generates the image.

D2 @ GitHub.

A tiny little drawing app. Allow to easily create simple diagrams.

Creates diagrams from textual descriptions!
Kroki provides a unified API with support for BlockDiag (BlockDiag, SeqDiag, ActDiag, NwDiag, PacketDiag, RackDiag), BPMN, Bytefield, C4 (with PlantUML), Ditaa, Erd, Excalidraw, GraphViz, Mermaid, Nomnoml, Pikchr, PlantUML, Structurizr, SvgBob, UMLet, Vega, Vega-Lite, WaveDrom... and more to come!

Kroki @ GitHub.

A Web Framework for Rapidly Building Interactive Diagrams

Diagrams lets you draw the cloud system architecture in Python code.

It was born for prototyping a new system architecture without any design tools. You can also describe or visualize the existing system architecture as well.

• Diagrams @ GitHub.

Virtual whiteboard for sketching hand-drawn like diagrams.
Collaborative and end-to-end encrypted.

Diagramming and charting tool.

JavaScript based diagramming and charting tool that renders Markdown-inspired text definitions to create and modify diagrams dynamically.

Mermaid @ GitHub.

Communicate Complexity With Intuitive Diagramming

A diagram is worth a thousand words — especially when it comes to technical documentation. Visualize everything with Gliffy for Confluence.

Diagram from anywhere
Online diagramming tool for collaborating on wireframes, flowcharts, and more