Azimutt is a database exploration and documentation tool made for large databases. Try Azimutt now
PostgreSQL
The world's most advanced open source relational database. Use the DDL SQL dialect of PostgreSQL to design your database schema and convert it to the other ones.
DOT
Graphviz is an open source graph visualization software with a language, named DOT, to define the diagrams.
It has many visualization options and plugins.
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