Yappy provides a lexical analyser and a LR parser generator for Python applications. Currently it builds SLR, LR(1), and LALR(1) parsing tables. Tables are kept in Python shelves for use in parsing. Some ambiguous grammars can be handled if priority and associativity information is provided.
yodl implements a pre-document language and tools to process it. It lets you write a single document, then use a tool (e.g., yodl2html) to convert it to some final document language (HTML, man, LaTeX, etc.). Yodl's document language is easy to use and to expand. Predefined converters are available from Yodl to HTML, LaTeX, groff (manpages), text, and (experimentally) XML, but new converters can be added easily.
Zoem is a general-purpose macro/programming language that submits text to a two-stage transformation process. Macro expansion and interpretation is followed by application of customizable character filtering rules. Zoem supports inside-out evaluation, comprehensive IO, control operators, iteration, dictionary stacks, multidimensional data storage, arithmetic expressions, regular expressions, system commands, and more.