For those not in the known, Flatpak is an application container that lets you package your open source project as a standalone binary that can be easily distributed across multiple Linux-based operating systems, independent of the package manager of that particular OS. Flatpak 0.6.13 is now the latest version, coming three weeks after Flatpak 0.6.12, and it looks like it’s the biggest so far, bringing app layering support to flatpak-builder, as well as support for extensions directories. But that’s not all, as Flatpak 0.6.13 also ships today with greatly improved command-line support that offers users updated arguments for installing, updating, and uninstalling Flatpack packages, better DBus proxy filtering, support for defining the default branch per remote, supports for URIs to the “remote-add” and “install –from” commands, as well as support the “–finish-only” and “–allow-missing-runtimes” parameters to flatpak-builder.