You're talking my language, Dannyboy.

Welcome to the rabbit hole!

https://bedroomproducersblog.com/2018/12/28/free-vst-plugins-2018/

https://blog.landr.com/best-free-vst-plugins-2016/

https://www.makeuseof.com/tag/free-vst-plugins/

Some favorites of mine are:

Mr Ray (Oooo, I see it's upgraded now...I also like the MR Ray73 earlier version) http://www.vst4free.com/free_vst.php?id=273

Sweetcase https://www.beatlabacademy.com/sweetcase-vintage-electric-piano-vstau-plug-in-free-download/

The above two are awesome keyboards.

I also like the simple Optron 3A compressor, but there are other nice ones on this freeware page: http://www.vstplanet.com/Effects/Dynamic7.htm

And here's a mad little beauty of a Theramin VST called Spook Keys: https://www.kvraudio.com/product/spook_keys_by_simple_media

And then you might need free orchestras: https://hiphopmakers.com/free-orchestral-vst-plugins-best-orchestral-vst

You have to be sure if you're on a newer 64 bit operating system with Windows 10 that some of the older 32-bit VST plugs can be played. Some require "bridging" software (look up "JBridge" if necessary).

Enjoy.

http://www.soundclick.com/MarkKaufman