Decent Sampler is a free alternative to Kontakt. If you head over to , you can find hundreds of free, community-made vocal libraries.
Sidechain your distant voices to your kick or snare. This creates a "pumping" or "breathing" effect that makes the atmosphere feel alive and pulsing. Distant Voices Vst UPD Free Download
Spitfire Audio is the king of cinematic sounds. Their series is completely free and features several vocal libraries. Decent Sampler is a free alternative to Kontakt