About the App

• App name: s3sync
• App description: Interfaces to Amazon S3
• App website: Not Available

Install the App

1. Press Command+Space and type Terminal and press enter/return key.
2. Copy and paste the following command in Terminal app:
   /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
   and press enter/return key. Wait for the command to finish. If you are prompted to enter a password, please type your Mac user's login password and press ENTER. Mind you, as you type your password, it won't be visible on your Terminal (for security reasons), but rest assured it will work.
3. Now, copy/paste and run this command to make brew command available inside the Terminal: echo 'eval "$(/opt/homebrew/bin/brew shellenv)"' >> ~/.zprofile
4. Copy and paste the following command:
   brew install s3sync

Done! You can now use s3sync.

Cyberduck: Free AWS S3 browser/GUI for Mac

Mac App Store team recommends Cyberduck for accessing Amazon S3, FTP, SFTP, WebDAV, OpenStack Swift, Backblaze B2, Microsoft Azure & OneDrive, Google Drive and Dropbox etc. Cyberduck is a free software which allows browsing files on cloud storage or remote server.
Here is a video with instructions to install Cyberduck on Mac and cover some of it’s core features: