Niecza is a compiler
targetting the Common Language Runtime (.NET and Mono). Its goal
is to explore the static aspects of Perl 6 and the possibilities
for compile-time optimization.
is Larry Wall's reference implementation of the Perl 6 grammar,
parser generator, and some of the semantic verifier. STD is an
abbreviation of "Standard", as in "Perl6.0.0-STD". It is written in
Perl 6, transliterated into Perl 5 by viv.
It is also used by
various phases of several other compilers (mildew, perlito, elf).
viv ("vi" to "v", 6 to 5)
is a compiler that uses STD as its front-end. STD itself uses viv to
build. It is actively developed along with STD.
Perlito, also known as MiniPerl6,
is a subset of Perl 6, designed as a light bootstrapping language.
You can try it online. It is
actively developed here.
Pugs is written in Haskell.
Maintenance releases for successive versions of ghc are
Hackage. The most recent (18.104.22.16810519 as of this writing
(2011-07-27)) was released 2011-05-19.