This document is the fifth of the five interrelated reports of the Radioactive Waste Repository Metadata Management (RepMet) Initiative. The series of reports discusses the key aspects of data and related metadata for selected scientific and technical topics involved in the life cycle of a radioactive waste repository. The "RepMet Tools and Guidelines" report aims to provide fundamental information on the metadata tools and techniques employed in the three RepMet libraries in order to enable coherent understanding of the libraries.