Steghide - is a steganography program that is able to hide data in various kinds of image- and audio-files. The color- respectively sample-frequencies are not changed thus making the embedding resistant against first-order statistical tests. (Linux & Windows).
EasySteg - "is a cross-platform and portable software, written in C++. It use steganography and cryptography techniques to hide information inside uncompressed and compressed images. JPEG (JPG), TIFF, PNG, BMP image formats are supported. It really hides arbitrary data inside the image itself (not in metadata/comment fields or appended to the end of the file). With it's easy graphical user interface is possible to fine tune steganography parameters, evaluates image's artifacts and uses both symmetric-key and asymmetric-key cryptography. Arbitrary data can be hidden as compressed archive file and it's also possible to add a text comment."
Jsteg -
xiao 2.6.1 - Xiao Steganography is a mere matter of following a wizard. The three-step wizard could use a bit of trimming, though. Selecting the image file is the first step, but the app forces users to immediately click another button to open a file browser. Why not open with the browser at the ready? Nevertheless, the process is quick and simple. The step is repeated to pick the text file to hide. You'll get an error message if the text file is bigger than the image file. The final step includes entering a password and choosing from the five encryption and four hashing algorithms.
Stegsuite - is a free and open source steganography tool written in Java. With Stegosuite you can easily hide information in image files.
https://29a.ch/photo-forensics/#forensic-magnifier - images forensics