MoDisco is an Eclipse initiative that aims to provide a framework for extracting and exploiting models from legacy systems. It facilitates model-driven modernization tools for tasks like quality analysis, understanding legacy systems, reverse modeling, refactoring, and migration. MoDisco provides technology-specific and standard metamodels, as well as discoverers to create models from legacy artifacts like Java, C#, and databases. It has a modular architecture with layers for use cases, technologies, and infrastructure components.