javadoc
Beyond the level of what Javadoc does, DoctorJ compares documentation against code, using a 140,000 word dictionary. Among what it detects: misspelled words; missing, misordered, and misspelled parameter and exception names; undocumenetd classes, fields, methods, and parameters; and Javadoc tags that are invalid, misordered, missing expected argument, have invalid arguments, or missing descriptions.