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.
Open source project that offer summary and download services on this page is a project that carry out their development work on other open source development sites. Their work is linked to this page via a feature called OFI, and their work is not carried out here on OSDN site.