(AKA Freshmeat) was the original software release tracker, and is still available as archive.
Does as it says and tracks new and upcoming BSD / Linux / GNU / Solaris distribution releases.
Free Software directory
is the FSFs Wiki to summarize FLOSS packages and projects.
is a prettier frontend onto git source control.
Less suited for end users, but still allows searching for software.
is the development hub for Ubuntu and also lists a few things that
haven't made it into the package managers yet.
Captures progress and newly released gaming software for Linux.
Curates a list of Linux software alternatives for migrating newcomers.
Is the classic open source development service
and still home to and primary hub for many projects.