The Daisy, from Electrosmith of San Diego, is an open source music development system now available through Kickstarter. It’s based on the STM32 ARM Cortex-M7 running at 480MHz and has 24-bit stereo audio hardware with up to 192kHz input and output, and DIN MIDI support, as well as USB OTG-support as both host and device. In addition to the board:
there is also your choice of platforms to use this in, a breakout board, a guitar pedal, a Eurorack module, and a desktop synth with encoders and keys/pads, or of course you could embed it in your own custom HW application. There is a variety of language interfaces including PD, Max/MSP/Gen~, Python, FAUST, and C++.
Reference from Sonic State with video.
ADDED: Image of the four platform options:
ADDED: I really like this, and i might back it, but it’s hard for me to decide between this and the ELK Audio system, that i put up two posts back. Anyone have a thought on this?