Here are some of the commonly used pre-built adapters available in Oracle Integration Cloud:

1. Oracle SaaS Adapters: These adapters are designed to integrate with various Oracle Cloud applications, such as Oracle ERP Cloud, Oracle HCM Cloud, Oracle Sales Cloud, and more. They allow you to connect to and interact with Oracle’s suite of cloud services.
2. Oracle Database Adapter: This adapter enables integration with Oracle Databases, allowing you to read, write, and update data within your Oracle database systems.
3. REST Adapter: The REST adapter allows you to create integrations with RESTful web services. It’s commonly used for connecting to external web services and APIs.
4. SOAP Adapter: The SOAP adapter facilitates integrations with SOAP-based web services, which are still prevalent in many enterprise systems.
5. File Adapter: With the file adapter, you can work with files and directories, enabling file-based integrations. This is useful for scenarios involving data exchange through files.
6. FTP Adapter: The FTP adapter provides connectivity to FTP (File Transfer Protocol) servers, allowing you to transfer files between systems over FTP.
7. JDBC Adapter: This adapter is used for integrating with relational databases using JDBC (Java Database Connectivity). It’s not limited to Oracle databases and can work with other database systems.
8. MQ Adapter: The MQ (Message Queue) adapter enables integration with messaging systems, such as IBM MQ, to facilitate message-based communication between applications.
9. WebSocket Adapter: The WebSocket adapter allows you to integrate with WebSocket-based communication, which is common in real-time and event-driven applications.
10. Custom Adapter SDK: Oracle Integration Cloud also provides a Custom Adapter SDK, allowing you to create your own custom adapters when pre-built adapters do not cover your specific integration needs.