...PyQt applications may also be built on top of IndiClient, thus allowing rapid development of GUI Indi clients.
Besides Python there are also bindings for node.js, Tcl (incomplete) and PHP (not useful).
As application examples you will find a Python Websocket server with which you may build a web application interacting with Indi servers, and a simple PyQt application similar to the Kstars Indi Control Panel (was built as an exercise).