-
InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Facebook is a website and offers its interface via web. Its basically a webserver running on C++. The GUI is written in HTML/Javascript and transfered to your browser. If you click buttons your browser makes calls back to the server. There are more frameworks than you can count, personally I like https://github.com/yhirose/cpp-httplib a lot
The Spotify App is made with Electron which means it is basically a web browser (Chromium) running a web page pretending to be an app. The server side of spotify was apparently written in C++ initially but is shifting to Python more and more. The low level spotify library will likely remain being C++, you can estimate how this is made by looking at it's open source counterpart which is written in Rust: https://github.com/librespot-org/librespot