Free music for podcasts and other digital projects http://freemusicarchive.org/
BBC Sound Effects Library http://bbcsfx.acropolis.org.uk/
NASA Soundcloud https://soundcloud.com/nasa
Classical music samples http://www.philharmonia.co.uk/explore/sound_samples
Groove sample kit https://groove.de/2012/12/10/download-exclusive-mike-huckaby-sample-kit/
Drumkit created from a spacecraft facility http://cdm.link/2016/03/get-a-free-sampled-drum-kit-made-in-a-spacecraft-test-facility/
Sounds from Space http://www.esa.int/Our_Activities/Space_Science/Sounds_from_space
Legowelt Mixers http://legowelt.org/software/
Legowelt Samples https://awolfe.home.xs4all.nl/samples.html
GameBoy Drum Kit https://bedroomproducersblog.com/2015/04/08/game-boy-drum-kit/
Wavy Audio https://wavy.audio/
Ground Your Sound https://theproaudiofiles.com/free-sample-pack/
Jazzy vocal ad-libs https://www.musicradar.com/news/tech/sampleradar-327-free-vocal-ad-lib-samples-564055
More jazz samples https://www.musicradar.com/news/tech/sampleradar-466-free-jazz-club-samples-291818