Mountain Duck is a cross-platform utility from David Kocher (Iterate GmbH) that “lets you mount any remote FTP, SFTP, WebDAV, S3 and OpenStack Swift server storage as a local disk in the Finder. Open remote files with any application and work like on a local volume. Transfer files using Finder to remote servers, fast.” Among many MountainDuck features is support for Cryptomator interoperable secure vaults (like cross-platform, cloud-friendly versions of Apple’s FileVault-encrypted Mac disk images).
Mountain Duck 3.3.5 is priced at $39 for OS X 10.11 and later with a trial version available for downloading (and also is available for Windows). The latest release brings support for TLS 1.3 networking and support for Cryptomator Version 7 vaults. Version 3 brought a smart synchronization feature to add offline support:
Like Dropbox for any cloud storage with smart synchronization. Files are synchronized to your local disk when opened to allow offline usage and changes are uploaded in the background as soon as a connection is available. You can also explicitly select files and folders available for offline use.
URL Manager Pro is a bookmark manager from Alco Blom that is independent of any particular web browser and can synchronize bookmarks across Safari, Firefox, Chrome, and other apps. It offers a system-wide bookmarks menu, support for Spotlight searching of bookmarks, and support for gathering URLs from text files and other sources as well as from browsers. Other features include bookmark import/export among various browsers, plus browsing history. (See FAQ for additional details.)
URL Manager Pro offers you an array of powerful features for collecting, manipulating, and using very large collections of URLs. Not just URLs of Web pages, but also the URLs of email addresses, newservers, FTP sites, Telnet hosts, and more.
URL Manager Pro 5.0.1 is priced at $35 for macOS 10.13 and later. Older downloads are available for Mac systems going all the way back to Mac OS 9. The latest release “uses new Apple technologies like Auto Save and Versions, Sandboxing, Notarization and the Share button.”
Synchronize Pro X is an “industrial-strength” backup and file-sync app for older Macs from Qdea. Features include the ability to handle very large numbers of files with fast transfer, detailed control over sync operations, conflict resolution and manual overrides plus sync previews, automatic sync of watched folders, archiving of files, configurable error handling and warnings, incremental backup, scheduling, bootable backups, logging, AppleScript and more.
Synchronize Pro X 6.9 is a 32-bit application for Mac OS X 10.6 through macOS 10.14 but does not make bootable backups of macOS 10.13 or 10.14 systems, and no version is planned for macOS 10.15 or later. Licenses are available via email or phone contact. Synchronize X Plus is a lower-priced version with fewer features. A one-week demo is available.
Fetch is a very long-lived, full-featured Mac app for handling FTP, SFTP, and FTPS file transfers, featuring Bonjour support, auto-resume, droplets, Quick Look previews, folder sync, one-click editing of remote files, and more. The latest version is based on 64-bit code for compatibility with macOS Catalina while dropping AppleScript and Automator support.
Fetch 5.8 is priced at $29 for macOS 10.13 and later with a 15-day trial period. Older versions are available with support for earlier Mac systems (going back a long way).