Stan is a project mainly written in OCAML and PYTHON, based on the View license.
A STatic ANalysis tool for PL/SQL.
A PL/SQL STatic ANalyzer.
This seems to be missing from the PL/SQL ecosystem. There's a tool included with Toad For Oracle, but that one is not only commercial, but also expensive.
Besides, it looks like a nice learning project.
GPLv3 (see the COPYING file).