I just spotted the recent publication of this collection of tools for ideation and validation of open source hardware business models and revenue streams.
Could be relevant to some GOSHers!
3 Likes
Thanks @jcm80 for sharing! I should’ve thought of sharing this myself since I was on the OPENNEXT team. 
FYI, we also published an entire book about open source product development with case studies (with a focus on open source hardware):