No legitimate company has done this because:

Vintage synthesizer sounds that can be tweaked similarly to FM and subtractive synthesis engines. 2. Soundpaint

Decent Sampler is a lightweight, free alternative to Kontakt. Paired with the Pianobook community platform, you can access thousands of free, user-submitted sample libraries. Many contributors sample their own hardware synths, offering legitimate alternatives to commercial workstations. How to Get Genuine Yamaha Sounds in Your DAW

While these are designed for rather than Kontakt, tools like Translator 6 from Chicken Systems have added support for converting between Kontakt formats and Yamaha Montage file structures. With the right conversion software, these free libraries could potentially be ported to Kontakt format.

Below is a guide on what to look for in a Montage library, how to ensure you are downloading verified files, and the best ways to integrate these sounds into your workflow. The Power of the Yamaha Montage in Kontakt

So, does a verified free Yamaha Montage Kontakt library exist?

Rent or borrow a Montage, sample your favorite patches into Kontakt using a tool like (Logic Pro) or Kontakt’s built-in sampling . This is legal for personal use (not redistribution).

If you are a Montage owner, your first stop for safe, verified, and compatible downloads should always be official Yamaha channels. The is your primary source for free and paid expansion libraries. You will need to register your product and log in to access the downloads.

Use specialized tools to convert Yamaha Montage samples (WAV formats) into playable Kontakt NKI instruments.