libdwarf is a library and command line tool for manipulating DWARF data in ELF object files. The DWARF Debugging Information Format is of interest to programmers working on compilers and debuggers. All libdwarf distributions contain C source, the DWARF2 specification, and libdwarf specifications. Implementors often extend DWARF by adding new attributes and other things.
Absimpa is a Java class library that provides a recursive decent parser. It is an experiment in abstraction and Java generics. It tries to include only the essentials of what makes out a parser and to leave out, or rather leave free for specification, what is not relevant for the parsing process.
Trad4 is a fully concurrent, thread safe, graph based programming language that scales linearly on multiple cores. It is initially intended for deployment in the financial industry to model real-time risk. Trad4 is proposed as an alternative to the Von Neumann model of computer architecture. It is a new way of arranging programs in memory and a new style of flow-of-control.
gtkaml is an XML syntax and parser that extends the Vala.Parser and transforms all your tags into a valid Gtk+ UI class. It features a casual XML syntax for describing the way Gtk widgets are laid out in a (new) custom widget you're creating. Code "islands" (written in Vala) are used for widget signal handling and other methods/signals/properties that you're introducing. It doesn't depend on an external library at run-time, and it is much more readable than the usual UI boilerplate.
MetaCC is an annotation based lexer (scanner) and parser generator suitable for processing a wide range of languages, from small domain-specific languages to big ones like Java. Actions may be written directly as annotated Java methods. It contains examples of an expression language and Java 5 grammar.
Compiler for actsl is an extremely small compiler for a minimal low-level action-based programming language. The programming language has pointers with both references and dereferences, and therefore can do everything that can be done with C. The compiler can compile itself (bootstrap).