s3-batcher
S3 Batcher allows you to execute a number of operations in batch
...The specific use case that pushed me to build this was object versioning, where while you can restore specific versions, undelete and so on, you can only do this one file at a time. Therefore, if you are dealing with large amounts of objects, you don't have a quick way to do so (aws-cli even fails to work with pages -> https://github.com/aws/aws-cli/issues/3191 is still open by the time I am writing this).
For extended documentation and usage examples, check out the project on GitHub: https://github.com/mfogliatto/s3-batcher