AppStream makes machine-readable software metadata easily accessible. It is a foundational block for modern Linux software centers, offering a seamless way to retrieve information about available software, no matter the repository it is contained in. It can provide data about available applications as well as available firmware, drivers, fonts and other components. This project it part of freedesktop.org.
As a person who ages ago created and single letter (before the @) email address thinking myself clever and efficient… I’m amazed and distressed how many forms have insisted that my email address is invalid.