This video presents Ora2Pg, a free tool that you can use to migrate an Oracle database to a PostgreSQL compatible schema. Ora2Pg connects your Oracle database, scan it automatically and extracts its structure or data, it then generates SQL scripts that you can load into your PostgreSQL database.
Ora2Pg can be used from reverse engineering Oracle database for database migration or to replicate Oracle data into a PostgreSQL database. The video shows where to download it and talks about the prerequisites. It explains how to install Ora2Pg and configure it. At the end, it presents some examples of ora2pg being used.