Here's how to use it to generate schema relationship diagrams for PostgreSQL databases.
- Download the jar file from here (the current version is schemaSpy_5.0.0.jar)
- Note: There is a release candidate for version 6, but I couldn't get that to play nicely with graphviz on Mac OS 10.13
- Get the PostgreSQL JDBC driver (either the JDBC3 or JDBC4 jar file is fine)
- Install graphviz