Klang offer a collection of free Kontakt instruments.
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Komplete Start
Native Instruments offer a ton of sounds (2000) and instruments (Synths, Smaples Instruments) plus an organizer app (Komplete Kontrol) for free. Download here.
SARP
….is a free arpeggiator for Kontakt.
O’GRADY’S OLD DIRTY WURLI
Free sampled Wurlitzer for Kontakt
Concertmate 300
Free Kontakt version of the Concertmate 300 (You might remember it from Casio or Tandy) for some Chiptune sounds. Get it from Sonus Instruments.
Arcane
This might be the craziest library for Native Instruments Kontakt that you can find. It´s from Embertone and it´s free.
Chordian
..is a free MIDI sequencer for NI Kontakt from Home Grown Sounds.
PULSEHA
2 Free Kontakt instruments (Toy Piano, Synth). Click pic.
Waves Factory
Waves Factory have a bunch of Freeware plug ins and Kontakt libraries