The present invention provides modular cassettes for fiber management applications. Cassettes in accordance with the present invention comprise plural functional components that nest into a main housing portion to support various application and fiber types. In accordance with the present invention, such components can be added or removed depending on the application and configuration needs of the use environment. Advantageously, cassettes in accordance with the present invention incorporate resilient connections and nested internal components for easy assembly and disassembly with minimal tools.