ICAD, icad.org
AudioMostly, https://audiomostly.com/
Audacity, https://www.audacityteam.org
Data Mapper, https://observablehq.com/@duncangeere/data-mapper
TwoTone, https://twotone.io/
BBC Sound Effects, https://sound-effects.bbcrewind.co.uk/search?resultSize=30
Freesound, https://freesound.org