OpenFlowKit
Draw architecture diagrams by hand, write them as code, or edit them with an AI agent.
Sketch and share systems as hand-drawn diagrams

Diagramly creates diagrams with a hand-drawn appearance from typed connections, plain-language instructions or direct drawing. Users can start from templates for system architecture, process flows, data models and mind maps, then adjust the nodes, labels and routes on the canvas. Visual themes restyle the whole diagram, while frames and pinned views turn sections into a presentation. Finished work can be shared through a link, embedded in another page or exported to formats such as PNG, SVG and PDF. Animated exports provide another way to explain a sequence. The browser tool is useful for turning an early idea into a diagram others can review.
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