ChillerScapes is a Free Kontakt Library from Resomonics. It’s a free collection of chilling atmospheres & drones for horror, custom controls to increase or decrease intensity and pulsing rhythms. featuring 18 patches of chilling soundscapes and drones with a custom interface. An intensity dial allows you to evolve and build the sound, whilst other controls allow you to introduce rhythmic pulsing and distortion.
Tycho is free a spatial, cosmic, sci-fi oriented VST synth instrument, the emphasys is on expresiveness: velocity and aftertouch (no polyphonic aftertouch, alas) can do a lot to the sound, so try it with a full featured MIDI keyboard.