P2S3 is described as 'This utility securely generates a S3 Signed URL. You can send someone this link to allows them to upload a file to S3 without requiring you to creating them an IAM account or give them credentials. This method uses native AWS APIs' and is an app in the backup & sync category. There are four alternatives to P2S3 for Windows and Mac. The best P2S3 alternative is Cyberduck, which is both free and Open Source. Other great apps like P2S3 are MSP360 Explorer, MSP360 Drive and Bucket Explorer.