Model visualizers and designers - Object, SQL, NoSQL, GraphQL, JSON Schema

Model designers

https://lt-mayonesa.github.io/sqldesigner/

https://ondras.zarovi.cz/sql/demo/

https://my.vertabelo.com/model/BOvIPyea5SFxc3VWJ8TAlYArM2dInrCC (paid)

EF Core https://msawczyn.github.io/EFDesigner/

Model visualizer

EF Core https://db-diagrams.firebaseapp.com/demo

JSON Schema

https://app.quicktype.io/#l=schema

http://jlblcc.github.io/json-schema-viewer/

https://json-editor.github.io/json-editor/

GraphQL

https://apis.guru/graphql-voyager/

http://www.graphqldesigner.com/

https://graphqleditor.com/ (paid)