free tools of hidding messages underneath a file:
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Stegosuite > you can easily hide confidential information in image files.
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Steghide > lets you hide a secret file in image or audio file.
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Xiao Steganography > to hide data in BMP images or in WAV files.
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SSuite Picsel > to hide text inside an image file with a different approach compared to other tools.
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OpenPuff > a professional steganographic tool lets you store files in image, audio, video or flash files.
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StegSpy by SpyHunter http://www.spy-hunter.com/stegspy