For games and game developers, but still very useful for filmmakers. From the site:
"In celebration of #GDC2017 we are giving away 20GB+ of high-quality sound effects from our vendors here at Sonniss. You can use them personally or commercially without attribution. (Everything is royalty free)."
Here's the full tracklist: https://docs.google.com/spreadsheets/d/1aCBw_dNba_ajYziogKdi1nL7JmdggBwbZXBFSoNCAvY/edit?usp=sharing