Software
Software
Commercial
Stealthencrypt
DataMark Techologies (StegMark, StegSafe, StegCom, StegSign)
Others
Freeware / Shareware
Hide and Seek, LSB of GIF Files
StegoDos, Embeds data in LSB of screen images
White Noise Storm, embeds data in LSB of screen images
S-Tools, variety of file types (GIF, WAV, BMP) plus encryption
JPEG-JSTEG4, uses JPG files to hide content
Others
Good information source: http://stegoarchive.com/
Introduction to Steganography