Masterpiece is the sample player — it reads Hauptwerk and GrandOrgue libraries and builds the instrument's own console out of them. OpenPipes OS is the Linux distribution it runs on, tuned for real-time organ audio and available in ARM and x86 editions.
Masterpiece — sample player
Reads Hauptwerk and GrandOrgue sample sets, including straight from their RAR and .orgue packages, and plays them on the console the set describes. Up to 9.3x less memory than holding every sample resident, so a 44-stop organ fits on a Raspberry Pi. Standalone, VST3, LV2 and AU for Windows, macOS, Linux and Pi.
OpenPipes OS — ARM
Minimal 64-bit OS for Raspberry Pi 4/5. Pre-configured with GrandOrgue, RustyPipes, Aeolus, JACK, PipeWire and CALF, plus a web interface for running it headless.
OpenPipes OS — x86
Debian Trixie-based distribution for Intel and AMD PCs, with the same three switchable engines. Includes RustyPipes for Hauptwerk and GrandOrgue sets. Alpha release.