openHAB might be a bit more popular than Homematic IP. We know about 1 link to it since March 2021 and only 1 link to Homematic IP. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
The switches I'm using are from Homematic, they are the IP version (newer) which is using a cloud hosted in Germany. They are not zigbee, but they can work without outside connection (from what I have seen). At the moment I have the hub connected to a HA setup and they work fine together. I also have a few free standing switches from the same brand, and a few door and temperature sensors. They are high quality and... Source: over 1 year ago
You can start on a general home automation like openhab.org. Source: almost 2 years ago
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