Newfile is a "filestarter": it generate starter files using a full featured template preprocessor. It can also generate new project trees, e.g., for a FreeBSD port.
JTools.Ruby is easy way to access Java 2 class-files via scripts written in Ruby language. There are class-file disassembler, assembler and simple Ruby to Java bytecode compiler. The work is at the start point.
Generate C++ header files from cpp files. Inspired by javadoc, and doxygen style source commenting. No need to maintain two seperate files to represent one class. Create and keep your headers up-to-date with your cpp files with little effort.
The Voodoo compiler is an implementation of the Voodoo programming language. It provides both a stand-alone compiler executable and a Ruby API for generating code for target platforms.