Integration Cloud Service (ICS) offers an Execution Agent which you can download and install on-premises. This provides a local ICS instance. The Execution Agent is useful in several situations. When you have an ICS trial, it is valid only for a period of 30 days. After initial installation (which does require an ICS subscription), you can use the Execution Agent indefinitely. Secondly, you have full control over the Execution Agent since it is a local installation and not managed by Oracle such as the Oracle Cloud instances. This means you can for example log all requests and replies, install and test a custom Cloud Adapter or browse the Service Bus log files and deployments in case something goes wrong. Currently this is not possible in the Oracle Public Cloud without creating SR's. This blog post is based on the below version of ICS and might not be valid in future versions.
You can download the Execution Agent from the Agents page:
The installation requires Oracle Enterprise Linux 6 UC4 or above. Read the documentation here.