elementary OS 5.1 “Hera” is the culmination of one year of hard work, during which the development team implemented out-of-the-box Flatpak support to make it easier and secure for users to install third-party apps that are not available in the AppCenter, but are essential for their everyday tasks. For this, elementary OS 5.1 comes with Sideload, a new, in-house built graphical utility that lets you install Flatpak apps with single click. In addition, elementary OS 5.1 adds Flatpak support to the AppCenter so that users can manage Flatpak apps alongside regular applications from the official repositories.