There are 2 repositories under iwconfig topic.
Wireless tools for Node.js
📶 Looped iwconfig program of wireless-tools package for checking Wi-Fi connection quality
Wireless Tools for Linux. Cloned from https://www.hpl.hp.com/personal/Jean_Tourrilhes/Linux/Tools.html .
command-line or terminal-menu wifi setup application targetting linux machines without X11 (servers etc)