If you are looking for open-source sampled instruments to use in your music, here's a great repository:
sfzinstruments.github.io/
They use the SFZ format which is the best way to make sampled instruments. It's open-source, easy to edit (all based on text + audio files) and well documented.
To use these instruments in Ardour or other DAWs I'd recommend the open-source plug-in sfizz:
More about the SFZ format here:
sfzformat.com/
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