MultiTail lets you view one or multiple files like the original tail program. The difference is that it creates multiple windows on your console (with ncurses). Merging of 2 or more log files is possible. It can also use colors while displaying the log files (through regular expressions) for faster recognition of what is important. It can also filter lines (again with regular expressions). It has interactive menus for editing given regular expressions and deleting and adding windows. One can also have windows with the output of shell scripts and other software. When viewing the output of external software, MultiTail can mimic the functionality of tools like 'watch'.
Ganglia is a scalable distributed monitoring system for high-performance computing systems such as clusters and grids. It is based on a hierarchical design targeted at federations of clusters. Ganglia is currently in use on over 500 clusters around the world and has scaled to handle clusters with 2000 nodes.
ICPLD (Internet Connection Performance Logging Daemon) is a connection monitor that sends ICMP requests to IP addresses of your choice and monitors if your machine has a working network connection. It logs failed attempts to reach the hosts, and will stamp a log as soon as a reply is received. It keeps track of when and for how long the connection was unavailable and records both total down time and each occasion of interrupted connection. It supports IPv6 and can execute a command whenever a connection goes up or down, which is useful for alerting users.
Prewikka is a graphical front-end analysis console for the Prelude hybrid IDS framework. Prelude is a hybrid intrusion detection framework implementing an open communication layer for use by any security application. It offers the ability to unify currently available security tools into one, powerful, and distributed application. Providing numerous features, Prewikka facilitate the work of users and analysts. It provides alert aggregation, sensors and hearbeat views, and has user management and configurable filters. It has access to external tools such as whois and traceroute.
Tea4CUPS is similar in functionality to the *nix command "tee", but in the form of a CUPS (Common UNIX Printing System) backend. Tea4CUPS captures a print job's data in their final form while they are being sent to a printer (more precisely, to a CUPS backend), and at the same time allows you to dispatch these data to any number of commands.
RRDutil is a a tool to collect statistics (typically every 5 minutes) from multiple servers, store the values in RRD databases (using RRDtool), and plot out pretty graphs to a Web server on demand. The graph types shown include CPU, memory, disk (space and I/O), Apache, MySQL queries and query types, email, Web hits, and more.
LogBot is an IRC bot that creates Web-based logs in XHTML format. It uses the PircBot API to connect to an IRC server and is useful for disseminating online conferences and discussions of interest groups to those who do not use IRC. mIRC-style coloring is used and URLs are hyperlinked.
Osiris is a host integrity management system that can be used to monitor changes to a network of hosts over time and report those changes back to the administrator(s). Osiris takes periodic snapshots of the filesystem, configurations, and logs, and stores them on a central management host. When changes are detected, Osiris will log these events and optionally send email to an administrator. Osiris also has preliminary support for monitoring other system data, including user lists, file system details, kernel modules, and network interface configurations.