openHAB might be a bit more popular than Noisli. We know about 1 link to it since March 2021 and only 1 link to Noisli. 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.
I use a website called noisli.com for the background noise. You can give it a try if you would like to. Source: about 1 year ago
You can start on a general home automation like openhab.org. Source: almost 2 years ago
Noizio - Feeling that the noise of the big city is too much for you to bear?
ioBroker - flexible and modular application for the IoT and Smarthome
MyNoise - Custom shaped online noise machines. Many Many generic sounds
Home-Assistant.io - Home Assistant is an open-source home automation platform running on Python 3.
A Soft Murmur - Ambient sounds to wash away distraction.
Google Home - Set up, manage, and control your Chromecast, Chromecast Audio and Google Home devices.