Nmap ("Network Mapper") is a free and open source (license) utility for network exploration or security auditing. Many systems and network administrators also find it useful for tasks such as network inventory, managing service upgrade schedules, and monitoring host or service uptime.
Kaboodle is a free, open-source Internet app which provides:
* Complete visualization of your LAN, updated in near-real time.
* A point-and-click interface to take remote-control of what it finds.
* A "personal VPN" capability to securely connect Kaboodle-enabled LANs together across the Internet.
* File transfer, continous network monitoring, and more.
and Kaboodle is optimized for easy use; no TCP/IP expertise required!
(though it doesn't hurt...)
AutoAP is a script that continuously scans for open Wi-Fi connections, tests them for validity, and connects to the strongest signal. If the connection is lost, the script scans again and finds the strongest valid signal again, and maintains a continuous connection to the internet in a mobile or portable environment. The script paremeters are highly configurable, including ability to configure secure connections.
The Dude network monitor is a new application by MikroTik which can dramatically improve the way you manage your network environment. It will automatically scan all devices within specified subnets, draw and layout a map of your networks, monitor services of your devices and alert you in case some service has problems.
Measurement Lab (M-Lab) is an open platform for researchers to deploy Internet measurement tools. By enhancing Internet transparency, we aim to help sustain a healthy, innovative Internet.