iftop is yet another free opensource tool to measure bandwidth utilization on the network interfaces on your systems or servers. As the name predicts, iftop is what “top” utility is for CPU usage measurement.
IPplan is a free opensource IP Address management application. IPPlan is a web based IP address management software and tracking tool simplifying the administration of your IP address space. IPplan goes beyond IP address management including DNS administration, configuration file management, circuit management and storing of hardware information. IPplan can handle a single network or cater for multiple networks and customers with overlapping address space. Makes managing ip addresses and managing ip address space simple and easy.
ntop is a free opensource network traffic probe that shows the network usage. ntop is based on libpcap and can run on Linux/Unix and Windows operating system. ntop provides a very easy to use a web access to navigate through ntop traffic information and get a dump of the network status.
IPTraf is a console-based network statistics utility for Linux. It gathers a variety of figures such as TCP connection packet and byte counts, interface statistics and activity indicators, TCP/UDP traffic breakdowns, and LAN station packet and byte counts. IPTraf is an IP traffic monitor that shows information on the IP traffic passing over your network. IPTraf is very easy to use with the easy to use menus and the simplicity of configurations (if changing from defaults) makes it a real nice command-line network utility. IPTraf is a root only utility and cannot be run by standard users.