4 recommended

Been using Transmit for a few years now. Great product.
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2
Cyberduck

Libre (S)FTP, WebDAV, S3, B2, Azure, OpenStack Swift browser

Brandon AnzaldiSoftware Engineer @ ToTheTens · Written
Definitely a nice little FTP client. Solid interface, and it's been around for years.
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FranckInJapanSenior UI/UX Designer/Developer in Japan · Written
Simply the best for me. I particularily love the syncing feature between local and remote folders. Available for both Mac and Windows.
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Available for Mac, Windows, and mobile. You can preconfigure settings and push them out to your users.
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