Hey @aschrijver! Could you please add to your GitHub list a link or links about Validbook. It is not for profit and open source project. Here are the main links:
Validbook description and “Proposal to Cooperate” - https://lists.w3.org/Archives/Public/public-credentials/2018May/0024.html
Validbook alpha - http://futurama1x.validbook.org/
GitHub code repositories - https://github.com/ValidbookFoundation
I am not sure, to what category Validbook should be added. Although, primary service among Validbook Services is Validbook social - a social networking service. Validbook as whole is not just and mainly not about social networking. It is based on a more abstract, higher level paradigm of optimizing cooperation levels among humans, things and virtual entities. Functionaly, it is a set of cooperation services like - service to create Self-Sovereign Identity, Digital Documents Signing Service, Social Networking Service, etc. More in this post - Validbook - a universal platform for cooperation