Parsers are specified using a PEG grammar annotated with expressions to transform the parse tree
See the blog post accompanying the initial release.
metapeg is released under the MIT License.
metapeg was bootstrapped with cl-peg but can now compile and generate itself
The latest version is available from the darcs repository at: http://subvert-the-dominant-paradigm.net/repos/metapeg/
Update 2007-06-13 Metapeg 1.10, faster lisp implementation
Download metapeg releases at http://subvert-the-dominant-paradigm.net/~jewel/metapeg/