Sources

pcalc

A programmer's calculator available from Peter Glen

http://ibiblio.org/pub/Linux/apps/math/calc/pcalc-000.tar.gz
NASM

The Netwide Assembler, from the NASM Development Group

http://nasm.sourceforge.net
Nemesis

A command-line packet injection tool from obecian (Mark Grimes) and Jeff Nathan

http://www.packetfactory.net/projects/nemesis
dsniff

A collection of network-sniffing tools from Dug Song

http://monkey.org/~dugsong/dsniff
Dissembler

A printable ASCII bytecode polymorpher from Matrix (Jose Ronnick)

http://www.phiral.com
mitm-ssh

An SSH man-in-the-middle tool from Claes Nyberg

http://www.signedness.org/tools/mitm-ssh.tgz
ffp

A fuzzy fingerprint–generation tool from Konrad Rieck

http://freeworld.thc.org/thc-ffp
John the Ripper

A password cracker from Solar Designer

http://www.openwall.com/john