videos in AudioSet
A list of about a million ten-second YouTube clips, each labelled with the sounds in it, that Google published in 2017. Labs use it to train and test general audio and music models.
Including (www.blastwavefx.com) Winner: Tobias Poppe BWFX + Mix Sound Design Competition, Sonopedia 3.0 - Sound Effects Library Demo, App FX Sound Effects Library