point release distribution that has been around forever. many other distributions are based on it (ubuntu etc). uses the apt package manager
Rolling release distribution, strives to be bleeding edge. 64 bit support only with community support for arm and other architectures. uses the pacman package manager. has a community run packaging systems (AUR arch user repositories) where users can package sofware not available in the official repositories, this makes a lot of software available for the platform.
Bell labs successor to UNIX. never really took off has very interesting and novel ways of dealing with multi-users and networks.
collection of great gnome apps