Google dork
site:.s3.amazonaws.com "Company NAME"
https://github.com/ghostlulzhacks/s3brute
$ python amazon-s3-enum.py -w BucketNames.txt -d <Domain Here>
https://github.com/RhinoSecurityLabs/GCPBucketBrute
$ python3 gcpbucketbrute.py -k <Domain Here> -u
site:digitaloceanspaces.com <Domain Here>
https://github.com/appsecco/spaces-finder