SQLDEV PostgreSQL
https://substars.github.io/2014/01/06/oracle-sql-developer-and-postgres/
Add JDBC PostgreSQL driver to SQL Developer...
Save following text into temporary file C:\PostgreSQL\PostgreSQL_OracleSQLDeveloper.json (one line)
{"connections":[{"name":"PostgreSQL_TEST","type":"jdbc","info":{"customUrl":"jdbc:postgresql://hostname:5432/postgres","hostname":"hostname","driver":"org.postgresql.Driver","port":"5432","subtype":"SDPostgreSQL","SavePassword":"false","RaptorConnectionType":"SDPostgreSQL","user":"username","ConnName":"PostgreSQL_TEST","Connection-Color-For-Editors":"-16777051"}}]}
Import C:\PostgreSQL\PostgreSQL_OracleSQLDeveloper.json as new connection to Oracle SQL Developer