CloudBerry Explorer!

Cyberduck is an open source FTP client.

odrive is a free application that makes it easy to manage, access, and share all of your files from one place. Integration into more than 20 services, full bi-directional desktop sync, placeholder files, a robust web client, and advanced sharing capabilities.

Air Explorer is an application that manages easily all your files in cloud servers (Google Drive, OneDrive, Dropbox, Mega, Box, Mediafire, WebDAV, Copy, Yandex,...) and FTP and SFTP services.It transfers files between the clouds, synchronizes folders between any cloud or your computer and, optionally can encrypt your files when you upload them to the cloud. Also, you can schedule your file transfers and synchronizations.Moreover, it supports multiple accounts from the same server and centralizes the search of your files across all the clouds.Air Explorer makes all your clouds work as one, allows drag'n drop files between your computer and the clouds and, copy/paste between cloud servers and pause and continue uploads and downloads.It doesn't lose the clouds features like thumbnail view of the pictures and sharing files.It works with a plugins system to add cloud servers. Air Explorer can manage your files using the command line. »

"Dual pane file manager and SFTP/FTP client for Mac OS XForkLift is designed to be the fastest, most powerful file manager for the Mac. Connect to FTP or SFTP servers, manage your Amazon S3 account or your mobile devices over Bluetooth. All these features are beautifully integrated into a sophisticated, yet easy to use Cocoa based interface. Dual-pane view will dramatically increase your productivity along with state-of-the-art features like live preview, spring loaded folders and any-to-any workflow. All this to be topped by tabs, to keep your workspace nice and clean." »

ExpanDrive is a Network file system client for Mac OS X and Microsoft Windows that facilitates mapping of local volume to any SFTP server the user can access. It also can connect to FTP, Amazon S3, RackSpace Cloud Files, OpenStack Swift Object Storage, DreamObjects, WebDAV, Dropbox, Google Drive and Box.com. When a server is mounted with ExpanDrive any program can read, write, and manage remote files (that is, files that only exist on the server) as if they were stored locally.

The SME Enterprise File Share and Sync Solution provides a comprehensive control and management solution to enable secure cloud collaboration across data points for corporations.

Gladinet Cloud Desktop mounts cloud storage to your local desktop PC. It is a simple desktop application.

It's free app, which can combine cloud drives for Dropbox, Box, Google Docs, SkyDrive, SugarSync, FTP, etc, so that you can merge them together and centralize management.

Jungle Disk is a leading provider of online storage software and services, leveraging the Amazon S3 platform and Rackspac infrastructure to provide easy to use and cost effective online storage and backup to our customers. The multi-platform Jungle Disk software allows users to access an unlimited online storage space via a virtual drive and also includes comprehensive automatic backup features.

Cloud Combine is a browser and manager for the cloud services. It supports Microsoft Azure, Amazon AWS, Google Cloud and FTP.

Yarkon is a a modern, responsive and intuitive web based user interface for Amazon S3. Use it to manage buckets, create folders, upload and share files - anything that you normally do with S3, but with a fluent, intuitive and feature rich user experience, similar to what you have when using your PC. Drag & drop, context menus, copy-paste, it is all there.

S3 Browser - Windows Client for Amazon S3. User Interface for Amazon S3. Allows you to manage your Amazon S3 Buckets and files with ease!

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 the getSignedUrl method provided by AWS.