Is there a free (as in freedom) alternative to Publons
It seems now there is a free (as in free speech) alternative, via ORCID. A few months ago they introduced a system to make verifiable peer reviews visible in your profile. You can read more about it here. I was thinking of making a Publons profile, but given that it is owned by a commercial entity, it ends up being just another data mining company, very much like academia.edu and researchgate are. Great that we have now an alternative!