This site is served via GitHub Pages and Cloudflare. Refer to them for any information or statistics they may collect.
To view how this site is built, see its repository and this post, which details the setup.
For Android applications, I don’t collect any data.
For apps installed through the Google Play Store, Google does collect some data automatically, such as the number of installations, and the countries, Android versions, and similar data about devices it is installed on. I don’t share this data in any way, but I have no idea what Google does with it.