The poster describes the design and development of Matportal.org, an ontology repository for the Material Sciences domain. The Matportal.org project re-uses the biomedical domain’s semantic tools and insights to serve the community of Material Sciences and Engineering. Matportal.org offers a portal that features ontology hosting, search, versioning, visualization, comment, and recommendation; enables semantic annotation; stores and exploits ontology alignments, and interoperation with the semantic web. The poster shows the platform’s content, and features, including the additions to the original technology and preliminary outputs of six driving Material Sciences use cases that participated in the design and orientation of the project to anchor it in the community. Building on the experience and existing technology Matportal.org aims to provide the first ontology repository for the Material Sciences and Engineering domain.