iotaudit is a free, open-source tool for auditing what smart-home devices talk to on your own network. The site has short device pages for IP cameras, Tuya plugs, Hue bridges, Chromecast, Ring and others, plus guides for Home Assistant and sharing results. Install with pip install iotaudit and run it on your own network. Content is based on public documentation and iotaudit's device profiles.
I built iotaudit because I wanted to understand what my own IoT devices communicate with, without sending data to third parties. I wanted a simple, local audit and a readable report.