0 and 1 are two stores, containing a manually constructed set of services. They are meant to be used with the repo commands of s6-rc, or with the s6-frontend package, to help you get familiar with the commands. An uppercase service name means the service is a longrun. A lowercase one means the service is a oneshot. Services named E*|e* are essential. Services named R*|r* are recommended, i.e. they should appear as "active" rather than "usable" by default. Services named N*|n* are only "usable" by default. Foo-log means the service is a logger for Foo. "essentials" is a bundle that every non-essential service should depend on, in order to only start after all the essential services are up.