mess822 is a fast library for parsing Internet mail messages, with several qmail-compatible applications. It supports the full complexity of RFC 822 address lists and common RFC 822 extensions, and extracts each address as an easy-to-use string, with a separate string for the accompanying comment. mess822 also converts RFC 822 dates into libtai's struct caltime format, with support for numeric time zones, the standard old-fashioned time zones, and many nonstandard time zones.
The ucspi-tcp distribution contains tcpserver and tcpclient, which are easy-to-use command-line tools for building TCP client-server applications. tcpserver waits for incoming connections and, for each connection, runs a program of your choice. tcpclient makes a TCP connection and runs a program of your choice. This package includes several sample clients built on top of tcpclient: who@, date@, finger@, http@, tcpcat, and mconnect. tcpserver and tcpclient conform to UCSPI, the UNIX Client-Server Program Interface, using the TCP protocol. UCSPI tools are available for several different networks.
clockspeed uses a hardware tick counter to compensate for a persistently fast or slow system clock. Given a few time measurements from a reliable source, it computes and then eliminates the clock skew. sntpclock checks another system's NTP clock and prints the results in a format suitable for input to clockspeed. sntpclock is the simplest available NTP/SNTP client. taiclock and taiclockd form an even simpler alternative to SNTP. They are suitable for precise time synchronization over a local area network, without the hassles and potential security problems of an NTP server.
cdb is a fast, reliable, lightweight package for creating and reading constant databases. It features fast lookups, low overhead, no random limits, fast atomic database replacement, and fast database dumps. cdb is designed to be used in mission-critical applications like email. Database replacement is safe against system crashes. Readers don't have to pause during a rewrite.
hardmon is a hardware monitor which includes indicators for temperature, voltage, and fan speed. It displays these indicators in a graphical panel. The default configuration allows you to monitor up to 3 temperatures, 3 fan speeds, and 6 voltages. This tool is particularly useful for multi-processor systems. The look may be changed by configuring the panel's pixmap and by altering the indicator positions.