The Freshmeat Open Source Repository, http://www.freshmeat.net
minicom, http://www.netsonic.fi/~walker/minicom.html
C-Kermit, (UNIX, VMS)/Kermit 95 (Windows), http://www.columbia.edu/kermit/ckermit.html
TeraTerm Pro (Windows), http://hp.vector.co.jp/authors/VA002416/teraterm.html, http://www.zip.com.au/~roca/ttssh.html
Ethereal, http://www.ethereal.com
ngrep, http://ngrep.sourceforge.net
tcpdump, www.tcpdump.org
nmap, www.nmap.org
strobe, http://www.luyer.net/software/strobe-classb/
mtr, http://www.bitwizard.nl/mtr/
BIND, http://www.isc.org
dnstracer, http://www.mavetju.org/unix/general.php
aicmpsend, http://www.elxsi.de
sendip, http://www.earth.li/projectpurple/progs/sendip.html
IP Sorcery, http://www.informony.com/ipsorcery.html
Packet Excalibur, http://www.securitybugware.org/excalibur/
hping2, http://www.hping.org
Traffic, http://galileo.spaceports.com/~rsandila/traffic.html
cdpd, http://netcert.tripod.com/ccna/switches/cdp.html
cdpr, http://www.monkeymental.com/nuke/index.php
lcdpd, http://lcdpd.sourceforge.net/
Netperf, http://www.netperf.org/netperf/NetperfPage.html
NetPIPE, http://www.scl.ameslab.gov/netpipe/
ttcp/wsttcp, http://www.pcausa.com/Utilities/pcattcp.htm, http://www.cisco.com/warp/public/471/ttcp.html
Sam Spade, http://www.samspade.org/ssw/
Scapy, http://www.cartel-securite.frpbiondi//projects/scapy.html
ISC-DHCP ancillary tools, http://www.mavetju.org/unix/general.php