NetAdmin
FreeNATS, is an open-source network monitoring. Netdisco is an Open Source web-based network management tool. Designed for moderate to large networks, configuration information and connection data for network devices are retrieved by SNMP. Wi-Fi analysis, and troubleshooting on Mac OS X and Windows. Netstat a built in Unix and Windows. About XnetBITcom Xnet is a native Mac OS X network and server monitoring tool,developed in Cocoa, with a beautiful Aqua interface, supporting all common internet services likehttp, ftp, telnet, pop3 a.
is a fully automated powerful monitoring tool which continuously provides diverse information on the network you are connected.In your offices and homes, many devices would have been connected to the network. Some may be strictly controlled, and some may not. And some may consist of general computers and printers, and some may consist of wi-fi networks where mobile devices are connected to.
NetAdmin lets you find all the devices connected to your networks automatically without a separate monitoring collection server in any environment. This tool also collects information, and manages and monitors the connection history and information continuously.
Mac Network Monitoring Tools

Features:
- Stand-alone data collection in your iMac or MacBook.
- Fully automated operations
- Easy UI that provides various information required for network management
- Host status charts within various given period (90 min. to 1 year)
- Network and host status reporting (PDF, print), exporting via CSV
- Additional features such as MIB Browser (SNMP v1/v2, keyword searching, exporting via text/CSV)
- Configurable icon and name for each device
- Wake On LAN

Network Monitoring Tool For Linux
Stats:Free Network Monitoring Tools For Mac Os X
- Up/Down status of each host (with chart)
- Ping response time (with chart)
- NetBIOS, Bonjour, MDNS, UPNP information
- Port scan and launch application with opened port
- NIC Vendor country/company (with OUI DB update feature)
- Public IP allocation history
- IP allocation history on each host
- Connected networks history for each host
- Wi-Fi information for connected network
- SNMP walk information on the network
- Host type analysis: Windows, Linux/Unix, Mac OSX, Mobile device, Network printer, VOIP phone