Pisth - Pisth is an open source SSH and SFTP client for iOS.
Prompt 2 by Panic - The best SSH client for iOS
Dataplicity - Dataplicity is a remote terminal for your Pi.
Termix - Modern and easy to use ssh client for macOS and Windows
Commander One - Free dual-pane file manager for Mac with PRO Pack of features.
Transmit iOS - Upload/download from a private server, website, or S3 in iOS