toro4n (toro4n.com) is an online tool for drawing graph data models for Neo4j and other property graph databases: nodes, relationships, labels, and properties, with layers, notes, and automatic layout. You can export models to Cypher, JSON, SVG, and PNG. There's nothing to install, and no account is needed: models are saved in your browser. Signing in is optional and lets you save models online, share them with specific people, work on them together in real time, and restore earlier versions.
The app needs JavaScript. Learn what toro4n does, read the user guide, or see the example models.