This page lists known applications that take advantage of the network interface in gqrx.
Starting with version 2.3 gqrx can be controlled remotely using a simple TCP connection. Currently, the remote control functionality is limited to setting and reading a few parameters but more handles might be added in the future.
Starting with version 2.3 gqrx has an option to stream the audio over UDP to a remote host. This can be used to send the audio to external data decoders or for remote monitoring. This post describes the streaming functionality in gqrx and provides a few examples for how to use it.