The document introduces MDEForge, a new collaborative modeling platform that aims to address challenges with current modeling tools. MDEForge will provide (1) a community-based modeling repository for developing, analyzing, and reusing modeling artifacts, (2) an online modeling tool appstore to support developing new languages and editors, and (3) modeling tools as a cloud-based software as a service. It will support features like model transformations, identifying model chains, applying metrics, model differencing, and collaborative modeling. The framework will leverage technologies like EMF, MongoDB, ATL, and RESTful web services.