If you need free sound effects for your projects,u can download them from : 

1. http://www.audiomicro.com/sound-effects
2. https://www.lucidsamples.com/free-sample-packs/181-free-sound-effects-sfx-pack.html
3. http://www.sfxsource.com/Sound-Effects/
4. https://music-for-video.com/blog/free-sound-effects-for-videomakers
5. http://www.freesfx.co.uk/soundeffectcats.html
6. http://www.vionline.com/sound.html

If you know more recources with free sound effects,pls share with me.