Jesse Kornblum is a computer forensics author, researcher and engineer. You can read more about him in his Wikipedia entry or his official web site. His Curriculum Vitae has a current list of his papers. He current works for ManTech.
md5deep - Cross platform recursive hashing program. Computes MD5, SHA-1, SHA-256, Tiger and Whirlpool hashes. Can also match against sets of known hashes.
foremost - File carving program
ssdeep - Usually called Fuzzy Hashing, this program implements Context Triggered Piecewise Hashing.
FRED - The First Responder's Evidence Disk
dc3dd - A patch to add forensics features to GNU dd