user12201: I'm having fun with HitFilm software and playing with my kids to make movies. I'd like to add some VFX to our creations. Where can I find a good bunch of stock video and audio effects? 
Usually our movies are Full HD resolution. 

user30029: if you are looking for free VFX you might want to check out 
https://nomadnationstore.com/
They offer a monthly growing library for free VFX Assets in HD and 4K
No registration or whatever needed. Just download and have fun. 

user12201: I've just found this nice Video & Filmmaker Magazine list of free stuff.
Some of them:

Chroma Key Backgrounds 
Cute Stock Footage
LightLeakLove


user27301: https://www.actionvfx.com/collections/free-vfx/category
https://www.productioncrate.com/
These are the best free ressources I found, especially the ones from ActionVFX

12201: <p>I'm having fun with HitFilm software and playing with my kids to make movies. I'd like to add some VFX to our creations. Where can I find a good bunch of stock video and audio effects? </p>

<p>Usually our movies are Full HD resolution. </p>
 30029: <p>if you are looking for free VFX you might want to check out </p>

<p><a href="https://nomadnationstore.com/" rel="nofollow noreferrer">https://nomadnationstore.com/</a></p>

<p>They offer a monthly growing library for free VFX Assets in HD and 4K</p>

<p>No registration or whatever needed. Just download and have fun. </p>
 12201: <p>I've just found this nice <a href="http://videoandfilmmaker.com/wp/index.php/free-stuff/" rel="nofollow noreferrer">Video &amp; Filmmaker Magazine</a> list of free stuff.
Some of them:</p>

<ul>
<li><a href="https://www.youtube.com/user/acterencom/videos" rel="nofollow noreferrer">Chroma Key Backgrounds</a> </li>
<li><a href="http://www.cutestockfootage.com/" rel="nofollow noreferrer">Cute Stock Footage</a></li>
<li><a href="http://lightleaklove.com/products/light-free" rel="nofollow noreferrer">LightLeakLove</a></li>
</ul>
 27301: <p><a href="https://www.actionvfx.com/collections/free-vfx/category" rel="nofollow noreferrer">https://www.actionvfx.com/collections/free-vfx/category</a></p>

<p><a href="https://www.productioncrate.com/" rel="nofollow noreferrer">https://www.productioncrate.com/</a></p>

<p>These are the best free ressources I found, especially the ones from ActionVFX</p>
