A Cyberduck alternative that does not stop at the transfer.
Mongrel is a Cyberduck alternative for people who already live in databases and shells. Dual-pane S3, WebDAV, Azure Blob, SMB, FTP, FTPS, SFTP, and SCP sit in one File Manager, next to SSH terminals and 30+ database engines — not in a separate bookmark window.
Windows x64 and ARM64 · macOS Apple silicon · Linux x86-64
// Why you are here
Cyberduck is a great client. It is still only a client.
Cyberduck made S3, FTP, and a long list of cloud bookmarks easy. Mongrel takes the overlapping protocols — S3-compatible object storage, WebDAV, native Azure Blob, SMB, FTP/FTPS, SFTP/SCP — and puts them in the same desktop app as the query and the shell you open next.
// What ships
What you get when transfers share the workbench.
S3, WebDAV, Azure Blob, and classic protocols
Amazon S3 and S3-compatible stores (Spaces, MinIO, R2, B2, Wasabi), WebDAV, native Azure Blob REST, and SMB/CIFS share the File Manager with FTP, explicit and implicit FTPS, SFTP, and SCP.
Dual-pane File Manager
Local and remote panes, Name/Size sort, a non-selectable .. row, drag-and-drop ghosts, a resizable Transfers drawer, Resume, Sync this folder, a durable queue, and remembered local folders.
SSH terminals in the next tab
SFTP reuses the SSH terminal profile you already configured. Keys, agent auth, and jump hosts are not a second product.
Databases in the same window
Thirty-plus engines sit beside File Transfer, so the dump you just pulled is one click from a query instead of another desktop client.
Object storage without pretend POSIX
S3 and Azure Blob listings treat prefixes as folders. New Folder writes a prefix marker. Rename is copy-then-delete. Resume uses multipart parts or HTTP Range.
Keychain-held secrets
S3 secrets, optional STS tokens, WebDAV passwords or bearer tokens, Azure account keys or SAS, SMB passwords, and FTP/FTPS credentials stay in the OS keychain.
// Side by side
Mongrel vs Cyberduck, feature for feature.
| Capability | Mongrel | Cyberduck |
|---|---|---|
| S3 and compatible APIs | Amazon S3, Spaces, MinIO, R2, B2, Wasabi in File Transfer | Amazon S3 plus many cloud storage connectors |
| WebDAV and Azure Blob | WebDAV (Nextcloud, ownCloud, IIS) and native Azure Blob REST | WebDAV plus Azure, GCS, OpenStack, and consumer drives |
| FTP, FTPS, SFTP, SCP, SMB | Dedicated File Transfer profiles plus SSH SFTP with SCP fallback | FTP, SFTP, and WebDAV bookmarks |
| Consumer and other clouds | Not OneDrive, Dropbox, Google Drive, Box, or GCS | Azure, GCS, OpenStack, OneDrive, Dropbox, Google Drive, Box |
| Desktop workbench | File Manager plus terminals, 30+ databases, Docker, Kubernetes, API Client | A focused transfer client (Mountain Duck adds a drive letter) |
| Price and license | Commercial; annual plans from $99/year with a free 7-day trial | Free and open source |
// Honest tradeoffs
Where Cyberduck still has the edge.
Cyberduck is free and open source and connects to Google Cloud Storage, OpenStack Swift, and consumer drives (OneDrive, Dropbox, Google Drive, Box) Mongrel does not speak. Mountain Duck adds a drive letter. Keep Cyberduck when those endpoints matter. Choose Mongrel when S3, WebDAV, Azure Blob, SMB, and classic file protocols belong next to SQL and SSH, not in a second app.
// FAQ
Frequently asked questions.
What is a good Cyberduck alternative?
If you only need a free bookmark-style client for many cloud vendors, Cyberduck remains a strong fit. If transfers sit next to SSH sessions and databases, Mongrel is a Cyberduck alternative that keeps S3, WebDAV, Azure Blob, SMB, FTP/FTPS, and SFTP in one dual-pane File Manager inside a desktop workbench.
Does Mongrel connect to Amazon S3 like Cyberduck?
Yes. File Transfer → S3 with a blank endpoint uses the SDK regional resolver. Compatible endpoints cover DigitalOcean Spaces, MinIO, Cloudflare R2, Backblaze B2, and Wasabi.
Does Mongrel support OneDrive, Dropbox, or Google Drive?
No. Those connectors are a Cyberduck strength. Mongrel covers S3-compatible object storage, native Azure Blob, WebDAV, SMB, and classic FTP/FTPS/SFTP/SCP, not consumer drive APIs.
Does Mongrel support WebDAV or Azure Blob?
Yes. File Transfer → WebDAV talks to Nextcloud, ownCloud, IIS, and other DAV servers. File Transfer → Azure Blob uses native Azure Blob REST with Shared Key or SAS, not the S3 API.
Can I use Mongrel on Windows, Mac, and Linux?
Yes. Native packages ship for Windows x64 and ARM64, macOS Apple silicon, and Linux x86-64. Cyberduck also covers those platforms; Mongrel adds the workbench around the transfers.
Is Mongrel free like Cyberduck?
No. Mongrel is commercial software with a 7-day trial and no credit card required. Keep Cyberduck when a free transfer-only client is enough.
Related guides and comparisons
S3, WebDAV, and FTP beside the rest of the work.
7-day trial. Windows, macOS, Linux. No credit card.