Sonniss has released the Game Audio GDC Bundle Part 4 - over 30GB of royalty-free, high quality sound effects. From the website:

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In celebration of GDC 2018 we are giving away 30GB+ of high-quality sound effects from our catalog. Everything is royalty-free and commercially usable. No attribution is required and you can use them on an unlimited number of projects for the rest of your lifetime.

The 8-part download is available here. Sonniss has also provided a torrent for the download.