Most (or all?) of iNaturalist's code is open source (typically MIT), see <a href="https://github.com/inaturalist">https://github.com/inaturalist</a><p>A lot of iNaturalist data is open data, see <a href="https://github.com/inaturalist/inaturalist-open-data">https://github.com/inaturalist/inaturalist-open-data</a><p>(It's up to each user to decide how they want to license their observations, photos, and sounds. The options are all-rights-reserved [no license], CC0, CC-BY, and various other CC license.)