dbForge Studio for Oracle Express is a free software that provides basic functionality for working with schema objects, user accounts, SQL scripts, and queries.
dbForge Schema Compare for SQL Server is a reliable, easy-to-use tool to compare and synchronize schemas of Microsoft SQL Server databases. It quickly analyzes database structure differences and propagates the changes to a required SQL Server.
Schema Visualizer allows you to create fully featured Entity Relationship Diagrams (ERD) based on any database which could be accessed with help of Oracle SQL Developer.
DTM Schema Reporter is a reporting tool for database schema. The program creates reports in RTF, XML, HTML, PDF, CHM (Windows HTML Help), Excel or plain text formats and supports all common database interfaces - ODBC, OLE DB, or Oracle Call Interface