Nmap - Nmap Free Security Scanner, Port Scanner, & Network Exploration Tool. Download open source software for Linux, Windows, UNIX, FreeBSD, etc.
LawnGuru - Get your lawn mowed on demand
Angry IP Scanner - Open-source and cross-platform network scanner designed to be fast and simple to use
LanDroid - Robotic grass mover (Roomba for your lawn)
Fing - Discover which devices are connected to any Wi-Fi network, map devices, detect intruders, assess...
Toadi - Autonomous robot mower powered by A.I.