Who’s On My Wifi is described as 'As the owner of a wireless network, you want to protect it from hackers and freeloaders. Download Who's On My Wifi and find them today' and is an app in the Network & Admin category. There are more than 10 alternatives to Who’s On My Wifi for a variety of platforms, including Windows, Mac, Linux, Android and iPhone. The best alternative is Nmap, which is both free and Open Source. Other great apps like Who’s On My Wifi are Angry IP Scanner (Free, Open Source), Zenmap (Free, Open Source), Fing (Freemium) and Advanced IP Scanner (Free).
Angry IP scanner is a very fast IP address and port scanner. It can scan IP addresses in any range as well as any their ports. It is cross-platform and lightweight. Not requiring any installations, it can be freely copied and used anywhere.
Zenmap is the official cross-platform GUI for the Nmap Security Scanner. It is free and runs on Linux, Windows, Mac OS X, etc. Zenmap aims to make Nmap easy for beginners to use while providing advanced features for experienced Nmap users.
Reliable and free network scanner to analyse LAN. The program shows all network devices, gives you access to shared folders, provides remote control of computers (via RDP and Radmin), and can even remotely switch computers off. It is easy to use and runs as a portable edition.
A handy systems and security-focused tool, Port Authority is a very fast Android port scanner. Port Authority also allows you to quickly discover hosts on your network and will display useful network information about your device and other hosts.
Fingbox is a cloud system to monitor and manage your network, based on Fing Apps, Applications and Tools. It's a secure, cross-platform, comprehensive solution to discover devices, scan services, analyze and customize your networks, from anywhere.