We have a wiki at https://wiki.personaldata.io. The goal there is to consolidate knowledge about the personal data ecosystem, and build tools acting on this knowledge.
This is in accordance with the current PersonalData.IO plan:
The first tool we want to have is thus one to help file Subject Access Requests, i.e. requests for your own personal data.
In an ideal world, wikis would be good tools to hold discussions. That’s not the case actually, so instead we use this Discourse for the discussion part.