Здравствуйте, все библиотеки официально бесплатны, или схвачены по временно бесплатным акциям.
Вот некоторые:
https://www.orchestraltools.com/sinefactory?srsltid=AfmBOooAMaJhwRcv01kQH3B7Ikk_wXHa1K2aqipuCz8FZPvspFgkXD0Q
https://www.pluginboutique.com/products/7853-Evolution-Devastator-Free-Pack?srsltid=AfmBOooazP9oQo2FIqRe8_EpGa9ihStWfSpXx-Q8qprOMXRyLjtQ_eIQ
https://impactsoundworks.com/product/snaps-claps-slaps-stomps-shouts/?srsltid=AfmBOooUB5I0QHyLd-1MPQ1lIpnaaudgUTbcF-uXj5tr8Q4euWsR2m33
https://www.spitfireaudio.com/bbc-symphony-orchestra-discover
https://www.sonuscore.com/shop/the-orchestra-elements/?srsltid=AfmBOoolDgAr4gK7l2NsCNOgUj8roaaLqKnccsK33W3Dd7cmN_oZLiAJ