syslog-ng as the name shows is a syslogd replacement, but with new functionality for the new generation. The original syslogd allows messages only to be sorted based on priority/facility pair, syslog-ng adds the possibility to filter based on message contents using regular expressions. The new configuration scheme is intuitive and powerful.
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VTun is the easiest way to create Virtual Tunnels over TCP/IP networks with traffic shaping, compression, and encryption. It is a user space implementation and doesn't need modification of any kernel parts. VTun supports IP, PPP, SLIP, Ethernet, and other tunnel types. VTun is easily and highly configurable; it can be used for various network tasks like VPN, Mobil IP, Shaped Internet access, Ethernet tunnel, IP address saving, etc.
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Etherape is an etherman clone which displays network activity graphically. Active hosts are shown as circles of varying size, and traffic among them is shown as lines of varying width. It is GNOME and pcap based.
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htdump directs an HTTP query to stdout. It has many options and SSL support, making it a good debugging and learning tool for Web/CGI developers or a powerful automation tool.
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