Available as an assembled Module and as a DIY project.
This Module is currently available.
Digital module for positioned as a software development platform
"The Toepler (named after a German scientist) is a digital module for 3U Eurorack systems, positioned as a software development platform. The core of the module consists of a Atmega32u4 and is compatible with Arduino and the well-known Mozzi Library. The size is 14 HP. Initially I made this module for myself. I wanted a development platform with which I could experiment with various Arduino libraries and use them in a broad context and also interface. e broad range of connectivity allows it to be used as a swiss army knife in a wide range of situations. MIDI and Mozzi also allow the module to be truly polyphonic. The most obvious use case is a digital VCO but audio effects such as a Wavefolder, Clipper, Chorus or Pitch Shifter are also possible."
https://www.tindie.com/products/sluisbrinkie/sluisbrinkie-toepler/
