Ossia Score is an open-source, cross-platform, intermediate sequencer designed for interactive arts, enabling the integration and control of various media types like sound, video, lighting, and sensor data. It acts as a central hub, arranging and sequencing data from diverse sources such as OSC, MIDI, DMX, and more, to create immersive, interactive performances or installations. The tool is highly versatile, supporting multiple connection types and protocols, making it compatible with a wide range of devices and software. Ossia Score is designed to be accessible to both beginners and advanced users, offering simple math expressions for quick control and advanced scripting options for complex behaviors. It empowers artists to create dynamic, responsive environments where the audience becomes an active participant, transforming passive consumption into active, dynamic participation.