ideas

https://www.sound-ideas.com

Audio

https://www.audiomicro.com
https://www.kvraudio.com

Effect

https://en.wikipedia.org/wiki/Sound_effect
http://www.sound-effects-hunter.com/
https://www.prosoundeffects.com/
https://www.asoundeffect.com/
https://www.soundeffectsplus.com/
https://www.youtube.com/results?search_query=Sound+effect
https://www.slideshare.net/search/slideshow?searchfrom=header&q=Sound+effect