Software
Analyzer: http://netgroup-serv.polito.it/analyzer/ (a public-domain protocol analyzer for Windows 95/ 98/NT)
cron: http://www.kalab.com/freeware/cron/cron.htm (a Windows port of the UNIX utility)
GNU Utilities for Win32: http://www.weihenstephan.de/~syring/win32/UnxUtils.html (ports of various GNU utilities for Win32 that run natively without an emulation layer; covers tar, gzip, and md5sum)
MinGW: http://www.mingw.org/ (minimalist GNU for Windows, which provides a gcc that produces Windows-native binaries)
Nessus: http://www.nessus.org/ (an open-source security scanner)
Netcat: http://www.atstake.com/research/tools/network_utilities/ (the TCP/IP Swiss Army Knife)
NMAP: http://www.insecure.org/nmap/ (the Network Mapper)
Osiris: http://osiris.shmoo.com/ ...
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