QuickMIDI

QuickMIDI enables you to connect a MIDI keyboard quickly and play sounds easily.
You can also add your favorite SoundFont (SF2) and change the tone.
You can use Keyboard Viewer for screen sharing.

Note 1: SoundKeyboard runs with wired (USB) and wireless (Bluetooth) MIDI keyboards. However, I cannot guarantee the operation with all MIDI keyboards.
Note 2: Developer may end support for older macOS without notice.