If you are looking for free options that provide a similar quality to the Montage, reviewers suggest these specific sources:
You want a sound that is better than the Yamaha Montage 8 for free? Forget emulating it. Surpass it. yamaha montage 8 kontakt library free download better
There is no official "Yamaha Montage 8 Kontakt library" released by Yamaha. Any website offering a direct "free download" of a fully functional Montage 8 library for Kontakt is likely either a scam, a virus, an illegally ripped sample pack, or a poorly made user patch that misuses the name for clicks. If you are looking for free options that