A high performance Common Lisp compiler. In addition to standard ANSI Common Lisp, it provides an interactive environment including an a debugger, a statistical profiler, a code coverage tool, and many other extensions.
PKSV (Pokemon Script Viewer/Editor) is a small program written in C used to decompile, edit and compile scripts in Pokemon Advance ROMs. It has a GUI version (the one most of you will want) and the original command-line version.