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https://github.com/michele-perrone/OpenPiano
I don't think there are any useful plugin builds of it, though, even though it's built on Juce
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As an (extremely) amateur musician I've had hours of fun with free soundfonts like these and the open source LMMS[0], which was nice and familiar to me since I'd played with pirated copies of FruityLoops (now FL Studio) as a teenager.
[0] https://lmms.io/
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Good resource. Some of the piano SoundFonts here are available in https://chiptune.app (Yamaha Grand Lite 1.1, Chateau Grand Lite 1.0, Abbey Steinway D 1.9, Steinway Grand 1.0). Play a MIDI file, open Settings tab, find them at bottom of SoundFont menu. (You can also drag-and-drop SF2 files.)