Zynthian is an Open Synth Platform based in Raspberry Pi, Linux (Raspbian) and Free Software Synthesizers (mostly).
The ZynthianOS SD-image includes all the software you need for building a ZynthianBox, including a good amount of sound libraries and presets. This repository contains presets, samples, soundfonts and config files for the different synth engines supported by Zynthian.
You can learn more about the Zynthian Project in any of our sites:
You can buy official kits in the zynthian shop: