While Flatpak 0.9.10 is a hotfix release that addresses a regression from version 0.9.9 in the D-Bus proxy, which made various apps to no longer function properly, Flatpak 0.9.9 was published this past weekend with more enhancements, including the split of the flatpak-builder command into a separate tool that application developers can use to package their apps as Flatpaks. So Flatpak-builder is now an open-source, standalone utility that can be downloaded from its own GitHub page, and it can be used for building Flatpaks from sources. This is a smart move from the Flatpak team as it should boost the adoption of the Flatpak format across more GNU/Linux distributions.