PlantUML alternatives

UML-focused and text-based — not ideal for quick visual brainstorming. About PlantUML →

Mermaid JavaScript-based diagramming tool that renders diagrams from text definitions. Free Excalidraw Virtual whiteboard with a hand-drawn aesthetic for diagrams, sketches, and brainstorming. Free Lucidchart Intelligent diagramming platform for flowcharts, wireframes, and technical diagrams. Free