openHAB is a Java-based open-source home automation platform that provides a unified abstraction layer to integrate and combine various smart home systems and technologies into a single solution. With over 200 specific add-ons supporting different brands, devices, technologies, and communication protocols such as Z-Wave, Philips Hue, Amazon Echo, Chromecast, and Sonos, openHAB offers an extensive range of supported products. The app also comes with an action plugin for Tasker and Locale for added convenience. The openHAB open-source initiative strongly supports its vibrant community, with over 13,000 registered users on the forum, which serves as a place to find guidance, help, and inspiration. However, it should be noted that you need an openHAB server for this app.