Particle illusion standalone version from Boris FX is now available for free
Once downloaded installed there is an in-app link to download MANY cool extra particle effects.
You can animate the cg effects in the standalone version and render to Mp4 format, up to ultra-HD resolution to composite with other video footage
Does require a site sign-up but I think it's well worth it for so many free cool particle effects!
Grab it here - https://borisfx.com/products/particle-illusion/