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 six alternatives to P2S3 for a variety of platforms, including Windows, Mac, Linux, Online / Web-based and Android. The best alternative is Cyberduck, which is both free and Open Source. Other great apps like P2S3 are Storage Made Easy (Paid), S3 Browser (Freemium), MSP360 Explorer (Freemium) and MSP360 Drive (Paid).
MSP360 Explorer provides a user interface allowing to access, move and manage files across your local storage and the cloud storage of your choice. Cloud file management software by MSP360 is available in two versions: Freeware and PRO.
MSP360 Drive makes your cloud storage available as local Windows disks or network drives. MSP360 Drive allows you to work with files in cloud storage directly from any file management utility, like Windows Explorer, as though they were located on your local computer.