Freeware - RdPiano SA-synthesis digital piano VSTi Plugin

https://github.com/giulioz/rdpiano?tab=readme-ov-file

RdPiano accurately emulates SA-synthesis digital pianos, such as the Roland MKS-20, RD1000 and the Rhodes MK-80 electric piano. It simulates the CPU-B board reused in different models, emulating the CPU and the custom chips. The emulation of the custom chips is derived from silicon analysis. It also approximates the BBD chorus and tremolo effect, albeit less accurately than the digital emulation.

Freeware - New York S&S Model B Piano Kontakt Instrument

https://www.pianobook.co.uk/packs/the-experience-new-york-ss-model-b/

The Experience – New York S&S Model B 

Steinway's famous semi concert grand with Performance and VR/Ambisonic perspectives - now with sympathetic resonance modeling

Freeware - creatools KEYS VSTi Plugin

https://musictop69.wixsite.com/creatools/keys

Acoustic, electric, electronic and digital keyboard samplemaps packed in an instrument with enough tools to allow you to freely edit, combine, modulate and mix them in creative and original way. ​

 Designed to help you synthesize your own original authentic sounds, configure and control them easily with your MIDI controller,​ use compression, saturation and convolution resonance to shape them to your taste and needs. Add reverb and delay for more depth, and use global filter to cut or emphasize acoustic aspects of your sound

Freeware - Somerville Sounds Assorted Instrument Plugins

https://somervillesounds.com/prototypes/

Soft Drums Lite

Dusty Felts Piano, 

Antiquarian Echoes Ambient Guitars,

The Meyer Choir

Rubber Bridge Plucks

Freeware - Ivy Audio Piano in 162 Kontakt Instrument Library

https://ivyaudio.com/Piano-in-162

Piano in 162 is a sample library of a Steinway Model B grand piano, available in Kontakt, SFZ, and Korg Kronos formats.

Requires full Kontakt.

Freeware - Westwood Instruments ROOTS Kontakt Instrument Libraries

https://www.westwoodinstruments.com/roots/

Works with Kontakt Player!

Untold Strings Strings transfigured into a mesmerising wall of sound. For any story; real, imaginary or that blurry place between the two. Made from the violas in our award-winning library, Novella Origin

New libraries include Drifting Winds and Dust Piano!

Freeware - The Love Piano Kontakt Instrument

https://vstbuzz.com/special/the-love-piano-kontakt-player-freebie/

The “LO.VE. Piano” is not “just another piano sample library“. This is something special – a piano that’s been created specifically for soft and intimate playing. Rather than creating a huge dynamic range, we focused solely on the lighter side of the piano. And when we say we focused, we mean it! We recorded 12 velocity layers between the soft to moderately loud dynamic range (no loud or “fff” dynamics here!) and also included hammer sounds pedal sounds (both of which can be added/removed) to give it even more persona. The library comes with 18 reverb IR, all chosen specifically to offer the most beautiful and lush sounds. This piano sounds beautiful, rich and intimate, while retaining its clarity and character, even at low velocities, making it perfect for film/TV/underscore/drama and so much more. The LO.VE Piano is completely free and compatible with Native Instruments Kontakt Player.

Freeware - The Crow Hill Company Vaults VSTi Plugin

https://thecrowhillcompany.com/vaults-free-plugin/

Vaults Beta is a free plug-in that marks the beginning of a never ending stream of free, original and inspiring sounds for you to keep forever. Attic Grand Piano. R+D Strings. Celest-A-Tone.

Freeware - ETI Roads Kontakt Instrument

https://eti-roads.com/home_en

A new View of a Studio Classic 

Bring the distinctive sound of the Rhodes MKII back to life and inspire your music productions with the ETI ROADS. 

Every single key of this instrument was captured with the utmost precision, for the most authentic and realistic sound possible. 

The unique sound of the ETI ROADS is now available to you as a KONTAKT instrument… … and it’s free!

Requires Full Kontakt.

Freeware - ETI Roads Kontakt Instrument

https://eti-roads.com/home_en

Bring the distinctive sound of the Rhodes MKII back to life and inspire your music productions with the ETI ROADS. Every single key of this instrument was captured with the utmost precision, for the most authentic and realistic sound possible. The unique sound of the ETI ROADS is now available to you as a KONTAKT instrument… … and it’s free! 

Full version of Kontakt required.

Freeware - Studiologic Numa Player VSTi Plugin

https://www.studiologic-music.com/products/numaplayer/

Numa Player is a completely free virtual instrument. It's not only the perfect companion for your SL Keyboard, but it is also much more! The User Interface scales to different monitor sizes to fit best in your Audio/MIDI setup and makes Numa Player the first Studiologic Instrument Player available for Mac, Windows and iOS. Numa Player is organized in 4 parts and includes 4 standing libraries with a lot of instruments. Each instrument can be assigned to any part and gives up to 4 dedicated sound controls, custom keyboard ranges and multiple settings.

Freeware - Heavyocity Foundations Free Kontakt Instruments

https://heavyocity.com/product-category/foundations/

Heavyocity has added new instruments to the free Foundations series for the free Kontakt Player:

Piano

Staccato Strings

Nylon Guitar

Synth Bass

Emotive Choir

Staccato Brass

Freeware - Quilcom SIM-EP Electric Piano VSTi Plugin

https://plugins4free.com/plugin/3298/

SIM-EP has its sound generation model built purely to simulate electric piano sounds like the old and much revered Rhodes and Wurlitzers of this world. It uses no samples, so it’s small, loads quickly and can be adjusted for a wide range of timbres, and can also be pressed into making many sounds well beyond its original remit.

Freeware - Strezov The Creative ToolboX: Steinway Grand Piano Kontakt Instrument

https://www.strezov-sampling.com/products/view/the-creative-toolbox-piano.html

ALSO AVAILABLE FOR DOWNLOAD VIA NATIVE ACCESS 

Powered by Native Instruments' Kontakt Player v7.2,0 or higher

To commemorate 10 years of Strezov Sampling we have created the "Creative ToolboX". The primary focus of this series is to serve all aspiring songwriters and producers as a sort of “one-stop VI shop”, giving everyone the sonic variety and freedom they’re in need of. The Steinway Grand Piano is the second part of the COMPLETELY FREE VIRTUAL BAND we’re aiming at giving all of you who read this! So, join us and rise to the top of the charts with the help of The Creative ToolboX! We're thankful to have had you on our side for these 10 years, and here's to many more to come.

Piano Genie - Free Browser Based Piano

https://piano-genie.glitch.me/

Have some fun pretending you're a piano virtuoso using machine learning! 

Use the 1-8 numbered keys on your keyboard (or the home row a-f and j-;) or touch the coloured blocks to play the piano. Use the space bar to control the sustain pedal. The more you pretend you're a real player, the better the melody (and you!) will sound.

Freeware - Spitfire LABS Autograph Grand Piano VSTi Plugin

https://labs.spitfireaudio.com/autograph-grand

Housed in the prestigious Woodshed Recording studios in Malibu, this Yamaha C6 grand has been graced by hundreds of musical legends — from Lady Gaga, Paul Simon, Ariana Grande and Barbra Streisand, to Metallica, RZA, and KoRn. Featuring just one preset, enjoy this piano in all its natural splendour, with pedal up/down controls and faithfully captured release triggers.

Freeware - XPERIMENTA Project Minima 2 Kontakt Library

https://www.xperimentaproject.com/minima-2/

 

Free Toolkit for Kontakt Full 6.6.1 or higher FREE The Xperimenta team is proud to present you our latest sonic effort, Minima 2. As its predecessor Minima, Minima 2 is a wide and completely free collection of acoustic and electronic instruments, that answer the needs of modern productions. Minima 2 is a self-sufficient tool for modern composers and producers, that includes Strings, Percussion, Prepared Pianos, Flutes, Vintage Synths, Basses and much more. Minima 2 deeply represent our philosophical approach to sampling: a continuum balance between modern sound design and classic recording techniques.  We hope you’ll enjoy Minima 2 as much as we did while making it.

Freeware - ZAK Sound Instruments VSTi Plugins

https://zaksound.com/products/

A few freebie instruments... Sapphire Guitar, Retro Keys VII, Infinite Space Piano, Downtown Colors

Freeware - Impact Soundworks Eighty Eight Piano Kontakt Instrument

https://impactsoundworks.com/product/the-88e/

What if you tuned every note on a piano to “E”, and played them all at once? Wonder no more: the unbelievably huge sound of The 88E is now playable at any pitch with this free virtual instrument loaded with sound design options, and created in partnership with YouTuber and mad scientist engineer Mattias Krantz.

Compatible with Free Kontakt Player

Freeware - Studiologic Numa Player VSTi Plugin

https://www.studiologic-music.com/products/numaplayer/

Numa Player is a completely free virtual instrument. It's not only the perfect companion for your SL Keyboard, but it is also much more! The User Interface scales to different monitor sizes to fit best in your Audio/MIDI setup and makes Numa Player the first Studiologic Instrument Player available for Mac, Windows and iOS.