SilentEye is a cross-platform application design for an easy use of steganography, in this case hiding messages into pictures or sounds. It provides a pretty nice interface and an easy integration of new steganography algorithm and cryptography process by using a plug-ins system.
Two main plug-ins family exists:
Format Plug-in :
Image format plug-ins: BMP and JPEG plug-in provided, which allow you to save encoded images into .bmp and .jpg files
Audio format plug-ins: WAVE plug-in provided for .wav files
Cryptography plug-ins: Allow application to encrypte data before hidding them, for example using AES 256.