Hi @Roger Sijstermans ,It is completely free. Even SSIS is free because it is a just component of the SQL Server. So, you need to pay for SQL Server instance, Enterprise or Developer edition. Microsoft Connector for Oracle will not work with SQL Server Standard edition.
For the reference, for the Microsoft Connector for Oracle V1.3: https://www.microsoft.com/en-us/download/details.aspx?id=105811
Required operating environment : Enterprise or Developer edition of SQL Server 2019 Integration Services, SQL Server 2022 Integration Services