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Parsec is designed from scratch as an industrial-strength parser
library. It is simple, safe, well documented (on the package
homepage), has extensive libraries and good error messages,
and is also fast. It is defined as a monad transformer that can be
stacked on arbitrary monads, and it is also parametric in the
input stream type.
This package comes without the compatibility layer for parsec2.
Note, that the module names overlap with those of newer parsec
versions, therefore I do not recommend to unconditionally use parsec3
as dependency in cabal files of packages for hackage. But you may
want to develop your code using this subset of parsec3 modules and
finally change the dependency from parsec3 to parsec in order to
avoid module ambiguities for users just installing your package. Your
own module ambiguities are best avoided by hiding packages.