Unix Beer: Comes in several different brands, in cans ranging from 8 oz.
to 64 oz.  Drinkers of Unix Beer display fierce brand loyalty, even
though they claim that all the different brands taste almost identical.
Sometimes the pop-tops break off when you try to open them, so you have
to have your own can opener around for those occasions, in which case you
either need a complete set of instructions, or a friend who has been
drinking Unix Beer for several years.
BSD stout: Deep, hearty, and an acquired taste.  The official
brewer has released the recipe, and a lot of home-brewers now use it.
Hurd beer: Long advertised by the popular and politically active
GNU brewery, so far it has more head than body.  The GNU brewery is
mostly known for printing complete brewing instructions on every can,
which contains hops, malt, barley, and yeast ... not yet fermented.
Linux brand: A recipe originally created by a drunken Finn in his
basement, it has since become the home-brew of choice for impecunious
brewers and Unix beer-lovers worldwide, many of whom change the recipe.
POSIX ales: Sweeter than lager, with the kick of a stout; the
newer batches of a lot of beers seem to blend ale and stout or lager.
Solaris brand: A lager, intended to replace Sun brand stout.
Unlike most lagers, this one has to be drunk more slowly than stout.
Sun brand: Long the most popular stout on the Unix market, it was
discontinued in favor of a lager.
SysV lager: Clear and thirst-quenching, but lacking the body of
stout or the sweetness of ale.