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LawnGuru - Get your lawn mowed on demand
ipcalc - IP Calculator. ipcalc takes an IP address and netmask and calculates the resulting broadcast, network, Cisco wildcard mask, and host range. By giving a second netmask, you can design subnets and supernets....
Lawn Love - Lawn care and maintenance at the push of a button.
Port Authority - A handy systems and security-focused tool, Port Authority is a very fast Android port scanner.
Robomow - Battery operated robotic lawn mower
whatmask - Whatmask is a small C program that will help you with network settings and subnet calculations.