I don’t know about hobbyists but there are less known companies doing open source hardware for sure, [1] here is an example of cool stackable parallel computi

I don’t know about hobbyists but there are less known companies doing open source hardware for sure, [1] here is an example of cool stackable parallel computing project. I participated on the campaign and received mine, but not sure how are they doing today, it was a while ago. Edit: Andreas Olofsson the original founder seems to be still active in the field [2] - [1] https://www.kickstarter.com/projects/adapteva/parallella-a-supercomputer-for-everyone https://www.kickstarter.com/projects/adapteva/parallella-a-s... - [2] https://x.com/zeroasic?s=21&t=xSlFhUGn5i8d8RkXrsgAIg https://x.com/zeroasic?s=21&t=xSlFhUGn5i8d8RkXrsgAIg