I keep finding stuff faster than my current capacity for testing it, so I just post my best hunches for portables based on apparent features and past experiences, hoping other users find them interesting enough to test.
SterJo has previously made other portables, so here's Wireless Network Scanner
SterJo Wireless Network Scanner is a small tool that scans your network in a few seconds and displays a list of all connected computers or devices.
Download SterJo Wireless Network Scanner
latest portable release (currently v1.1) from http://www.sterjosoft.com/network-scanner.html