I would like to get details about an inbound change set. I already know that I can get its name and Request ID through Event Monitor and only its name through Setup Audit Trail, but I would like to get (I need to use it at Wave Analytics) information about what the Change Set contains.
You can download outbound changeset using workbench.
1) Go to Salesforce Workbench , Then Migration -> Retreive
2) Put the exact name of changeset in Package names and tick Single Package then Next , Retreive.
It will download the outbound changeset as a zip file with all the changes you want.
Src: My Blog