HEATKEYS

Tests your audio equipment, speakers, room acoustics and hearing. Audio signals and test tones playable online. High resolution sound test files available for free download.

Internet Archive is a non-profit digital library offering free universal access to books, movies & music, as well as 150 billion archived web pages.

Head-Fi.org: Head-Fi covers headphones, portable audio, earphones, earbuds, headphone amplifiers and audiophile equipment.

Play pink noise in your browser.

YouTube is a place to discover, watch, upload and share videos.

Dreamviews is the largest Lucid Dreaming Community and Resource on the web. All about lucid dreaming, controlling dreams, sleep stages, dream signs, dream interpretation and more.

Thousands of people from around the world use SimplyNoise to block distractions, enhance privacy, aid sleep, mask Tinnitus, and melt away stress. The benefits of color noise have been utilized in clinics, schools, households, and offices.

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Download here useful mp3 to test your audio systems. Pink noise, sweep, sinus, etc An alternative to audio test tones generators

Download sleep inducing sound and noise mp3 audio files : Help your baby sleep better tonight: Make an inexpensive baby shower gift that you can personalize.