LinSSID
Graphical wireless scanning for Linux
LinSSID is graphically and functionally similar to Inssider (Microsoft™ Windows®). It is written in C++ using Linux NL80211 tools, Qt5, and Qwt 6.1.
LinSSID may be installed either by downloading source or binary from this site, or if you're using Debian/Ubuntu or one of its brethren, adding a ppa to your software sources and then installing it with your favorite application manager.
You can add the repository with:
sudo add-apt-repository ppa:wseverin/ppa
Builds are available for amd64...