It’s already been mentioned a lot, but I’ll echo it one more time. The Naked Amp Pack by
@austinbuddy is mandetory IMHO. It is like have every single amp that is available in the Fractal Library, ready to go at your fingertips, ready to play and tweak to your liking. Like has been said, the names mentioned are great for song/artist ready tones.
As I was in your position not long ago, I thought I would add a couple that I have grown to love, by testing the waters myself.
@Guitarjon created a library of just about every Metallica tone ever, many are great jump off points to create your own unique heavy tones.
@Choptones have really great presets for the Mesa Boogie Mark IIC+ that I love, super heavy, but great for rock AND metal.
@SilentUnderground has many artist specific packs that I have purchased like Slayer,Metallica,Megadeth,Lamb Of God,Pantera,Alice in Chains, and many more. Went a bit crazy on Black Friday! Check out their Preset A Day section it’s great.
@stltones are on the pricier side but they have been used on many major label productions for major bands, you can see a list on their site. These are very polished high end presets for downtuned Metal, Rock, pop, and everything in between. Lots of samples available on the site.
Last but not least one of my newest favorites for metal presets...
@SinMix , his presets of the EVH 5150 III, Mesa Boogie Mark IIC++,JCM 800, ENGL Savage, and many more, are absolutely bone crushing, solid and brutal tones.
I plan on buying the
@fremen metal pack tonight to try them out because I love what I hear. Alas, your ears will know what they love, most of these guys have videos on YouTube showcasing their presets and you’ll know which ones are for you.
Good luck and happy hunting! It can be super addicting
)