pfflowd is a small daemon which converts real-time state expiry messages from OpenBSD's PF packet filter into Cisco NetFlow datagrams. This allows very fine- grained traffic accounting in conjunction with NetFlow capable tools and places almost no incremental load on a PF firewall.
Squidalyser is a Squid log file analyzer that is designed to allow per-user scrutiny. It allows a non-technical user to extract information about Web usage patterns including the type of information downloaded, the sites visited, the graphics downloaded, and the amount of information (per-byte or per-file) accessed. All functions are accessed through a Web interface.
GKrellM xkb is a plugin for GKrellM that displays a small country flag indicating the currently-active national keyboard layout and two small CapsLock/NumLock indicators. It also has a popup menu to switch between the keyboard layouts. It requires GKrellM2 and the XKB X Window extension.
Host Grapher is a very simple collection of Perl scripts that provide graphical display of CPU, memory, process, disk, and network information for a system. There are clients for Windows, Linux, FreeBSD, SunOS, AIX and Tru64. No socket will be opened on the client, nor will SNMP be used for obtaining the data.
xseg (eXtented SErver Grapher) is a server monitoring tool. It can check whether your server's services are alive. Its output is written to an HTML file. xseg can check the services on both local and remote machines. xseg can also run user-defined shell commands and write the stdout of these commands to an output file. This makes xseg very flexible, since you can write your own shell scripts and xseg will run them and capture their output.
stresslinux is a minimal Linux distribution that runs from a bootable CDROM or via PXE. It makes use of some utitlities such as stress, cpuburn, hddtemp, lm_sensors, etc. It is dedicated to users who want to test their system(s) entirely on high load and monitor the health of these systems.
NetHogs is a small 'net top' tool. Instead of breaking the traffic down per packet type or per subnet, like most similar tools do, this groups bandwidth by process, and does not rely on a special kernel module to be loaded. So if there's suddenly a lot of network traffic, you can immediately see which PID is causing this, and, if it's some kind of spinning process, kill it.