Wifitap is a proof of concept for communication over WiFi networks using traffic injection. It basically allows one to communicate over an open or WEP 802.11 network without being associated, thus bypassing any AP side restriction such as MAC address filtering or station isolation.
Category:   Software > Sniffing

Ethereal is a free network protocol analyzer for Unix and Windows. It allows you to examine data from a live network or from a capture file on disk. You can interactively browse the capture data, viewing summary and detail information for each packet. Ethereal has several powerful features, including a rich display filter language and the ability to view the reconstructed stream of a TCP session.
Category:   Software > Sniffing

simple password sniffer. handles FTP, Telnet, HTTP, POP, NNTP, IMAP, SNMP, LDAP, Rlogin, NFS, SOCKS, X11, IRC, AIM, CVS, ICQ, Napster, Citrix ICA, Symantec pcAnywhere, NAI Sniffer, Microsoft SMB, and Oracle SQL*Net auth info. goes beyond most sniffers in that it minimally parses each application protocol, only saving the "interesting" bits. uses Berkeley DB as its output file format, logging only unique auth info. supports full TCP/IP reassembly, courtesy of libnids (all of the following tools do, as well).
Category:   Software > Sniffing

Packet Inspector is an advanced network traffic monitoring and analyzing, testing, and troubleshooting tool using packet analysis and protocol decode mechanisms. It captures all traffic over both Ethernet and WLAN (802.11a and b) networks and decodes all major and frequently used protocols including TCP/IP, UDP, HTTP, HTTPS, SMTP, POP3, TELNET, FTP, and so on. All information is displayed in simple English with an easy-to-use interface for anyone to master the tool with minutes of self-training. The flexible filters in Packet Inspector enable you to focus on the information that you are looking for.
Category:   Software > Sniffing

802.11b frame handling (capturing, creation, injection)
Category:   Software > Sniffing