PiBuddy is an open-source Raspberry PI / Linux device management app that provides SSH connectivity to your Raspberry Pi and displays CPU, Memory, Disk usage, and also the output for a custom command of your choice. The app will save successful connections so you will not need to manually enter connection details each time. The app will also save any custom command used with each device.
The app also offers a scan feature to help find your Raspberry PI on your Wifi network if you are unsure of the IP Address. New features have been added recently such as script deployment for multiple devices and a remote shell window for running commands with instant output.