nfswatch monitors all incoming network traffic on an NFS file server and divides it into several categories. The number and percentage of packets received in each category is displayed on the screen in a continuously updated display. It can also monitors the NFS reply traffic from a server in order to measure the response time for each RPC.
NetOculus is a network monitoring system that provides all the functions of the well-known monitoring system MRTG. It also has a number of its own benefits. It can automatically monitor any kind of detectable alteration in a computer network (and in relatively separated network areas). It can efficiently notify staff about hardware state changes. Analytical information is aggregated. Specific pieces of hardware are associated with the staff members who responsible for them. The solutions for solved problems are reported to the staff for further use.
pmping is a script that pings multiple hosts in parallel and gives audible results depending on host state. The sounds come from the internal PC speaker, thus not needing a sound card. It beeps when a host OS is losing many packets, or when it is down. If the host is down, the script can send an email notification or run a command. All aspects are fully customisable by the user.
multihomed is a script that can detect when your primary Internet uplink goes down and switch to a backup uplink. It's smarter than many similar scripts: it continuously pings several hosts around the Internet using both uplinks, and elects the best one as primary. You can define the priority with which uplinks are tried. This can be very useful if you have a per-traffic contract on one of your uplinks and a flat-traffic contract on another one: you can configure multihomed to use the per-traffic uplink only if the other one is not working. It runs as a daemon, and you can define the interval between consecutive checks. It can detect failures in your ISP's uplinks too; by checking multiple remote hosts around the Internet, you can tell if your ISP is fully working or not. This is much more reliable than simply pinging a single server or (worse) your default router. It is very flexible: you can easily customize the commands to execute whenever one of the links goes down.
IptablesWeb allows a user to inspect iptables logs and to receive email and alerts using a Web browser. It is plugin-based, portable to any database, and supports multiple languages and multiple users. It features the ability to duplicate each plugin in any number of blocks, each with its own characteristics. The update (refresh) time can be set on each block to reduce the CPU load. Blocks can be dragged and dropped to change their display order.
Pandora is a distributed system to monitor processes, performance, status, application, or operating parameters of almost any operating system. It has a decentralized management system, based on flexible user profiles, that allows the user to generate graphical reports, define alarms, and a full incident management system to operate a 24x7 monitoring team.