Network documentation and discovery: NetBox, Angry IP Scanner, SoftPerfect Network Scanner, PRTG Freeware and LanTopoLog.
Free, open-source IPAM and DCIM web application: sites, racks, devices, cables, prefixes, IP addresses, VLANs and circuits with a REST and GraphQL API. Runs on Linux (PostgreSQL + Redis) or in Docker; maintained by NetBox Labs and the community.
Free, open-source (GPL-2.0) IP and port scanner for Windows, macOS and Linux. Finds live hosts, hostnames, MAC vendors and open TCP ports across a subnet and exports results to CSV, TXT or XML. The Windows installer and macOS builds include Java.
Fast IPv4/IPv6 network scanner for admins: ping sweep, MAC and port discovery, shared folders, agentless WMI/registry queries and remote commands. Windows (incl. portable), macOS and Linux. Shareware (conditionally free): trial shows up to 10 devices.
PRTG Freeware is the free edition of Paessler PRTG Network Monitor: full monitoring features with ping, SNMP, WMI, flow and HTTP sensors, maps and alerts, limited to 100 sensors (about ten devices). The core server runs on Windows.
Portable tool that discovers the physical layer-2 topology of your LAN over SNMP and maps every host to its switch port, with link monitoring and alerts. Shareware (conditionally free): discovery is unrestricted. Windows and Linux builds.
