sleuthkit : Brian Carrier's replacement to TCT.

autopsy : Web front-end to sleuthkit.

mac-robber : TCT's graverobber written in C.

fenris : debugging, tracing, decompiling.

wipe : Secure file deletion.

MAC_Grab : e-fense MAC time utility.
AIR : Steve Gibson Forensic Acquisition Utility.
foremost : Carve files based on header and footer.
fatback : Analyze and recover deleted FAT files.
md5deep : Recursive md5sum with db lookups.
sha15deep : Recursive sha1sum with db lookups.
dcfldd : dd replacement from the DCFL.
sdd : Specialized dd w/better preformance.
PyFLAG : Forensic and Log Analysis GUI.
Faust : Analyze elf binaries and bash scripts.
e2recover : Recover deleted files in ext2 file systems.
Pasco : Forensic tool for Internet Explorer Analysis.
Galleta : Cookie analyzer for Internet Explorer.
Rifiuti : "Recycle BIN" analyzer.
Bmap : Detect & Recover data in used slackspace.
Ftimes : A toolset for forensic data acquisition.
chkrootkit : Look for rootkits.
rkhunter : Rootkit hunter.
ChaosReader : Trace tcpdump files and extract data.
lshw : Hardware Lister.
logsh : Log your terminal session (Borrowed from FIRE).
ClamAV : ClamAV Anti Virus Scanner.
F-Prot : F-Prot Anti Virus Scanner.
2 Hash : MD5 & SHA1 parallel hashing.
glimpse : Indexing and query system.
Outguess : Stego detection suite.
Stegdetect : Stego detection suite.
Regviewer : Windows Registry viewer.
Chntpw : Change Windows passwords.
Grepmail : Grep through mailboxes.
logfinder : EFF logfinder utility.
linen : EnCase Image Acquisition Tool.
Retriever : Find pics/movies/docs/web-mail.
Scalpel : Carve files based on header and footer.