In "a stunningly poor display of capitalism", SampleOddity has released Thrash DI, a free sample library for Native Instruments Kontakt.
Here's what the developer has to say about Thrash DI:
I have decided to release Thrash DI (Direct Input) for free! That means you can have this multisampled little brother to the big Thrash guitar library for the low price of zero dollars and zero cents.
Just download and chug away with powerchords, palm mutes, and single note sustains. You will need an amp sim to get the most out of this, unless you really really like the sound of clean, unaltered electric guitar.