OpMon is a network and system monitoring application based on Nagios with extended support for capacity planning, SLA, SLM, network discovery, service catalogs, report schedule, Davinci, a dashboard builder, and much more. OpMon provides a GUI for Nagios as well as full multi-language support. The license to use the opmon proprietary modules is free for 2 hosts and 20 services. OpMon comes with many open source applications like phplogcon, Nedi, ntop, nagtrap, OCSInventory, OTRS, and opcfg.
Watch My Network is a script that detects network devices connected to your network, and saves details of these devices to a MySQL database. You can access this data with a Web browser. This user interface has tabs like "Browsing History", "New Device Control", "IP - MAC Changing", "Vlan Search", and "Operating Systems Search in My Network". This program can be run repeatedly via crontab.
Nmap Observer is a small application that shows the results of an nmap scan in a Web interface. You just need to specify the range of the network on which the scan is to be performed. Then the scan results are saved to an XML file. Nmap Observer parses the results, saves the results to a database, and shows them to you.
Zentyal (formerly eBox Platform) is a small business server that offers small and medium businesses an affordable and easy-to-use enterprise-level computer network. It can act as a Gateway, Infrastructure Manager, Unified Threat Manager, Office Server, Unified Communication Server, or a combination of these.
DHCP Lease Query in PHP is a PHP class that will allow you to send DHCPLEASEQUERY packets to inquire about known leases from a remote DHCP server. It is similar in nature to ISC's OMAPI but without the hangs it creates, nor does it cause dhcpd to behave in a single-threaded fashion while talking to it. After all, it emulates an actual DHCP "helper" (relay agent) and, as such, all queries travel over IP. It is based on RFCs related to DHCP and follows the RFCs as closely as possible.