Schema Visualizer for SQL Developer
Schema Visualizer is a software that enables the creation of comprehensive Entity Relationship Diagrams (ERD) using any database accessible through Oracle SQL Developer.
SUMsoft Solutions 
Schema Version Control for Oracle
SVCO offers a comprehensive version control solution for schema objects in Oracle database server. With integrated features, it allows users to manage and control their database schema changes easily.
Schema Version Control for Oracle (SVCO)
An integrated version control solution for Oracle database server schema objects that automatically tracks and records changes directly within the database. No additional version control tool is necessary.