This might be the craziest library for Native Instruments Kontakt that you can find. It´s from Embertone and it´s free.
..is a free MIDI sequencer for NI Kontakt from Home Grown Sounds.
2 Free Kontakt instruments (Toy Piano, Synth). Click pic.
Waves Factory have a bunch of Freeware plug ins and Kontakt libraries
“Piano in 162” is a free sample library of a Steinway Model B grand piano, available in Kontakt, SFZ, and Korg Kronos formats. Click Pic.
After providing your Email adress you´ll get an 80s FM Piano and a shell patch for Native Instruments´ Kontakt from Tangent Edge. Click Pick.