Joining the project from Helsinki, Finland. I'm active in the Solidarity Economy Collective of Finland, which is associated with commons.fi (see below for English description, in case you're unfortunate enough not to understand Finnish).
I'm a geographer, but have been more active with alter-economic praxis, political ecology and critical cartographical theory rather than any actual mapping. Anyway, you can find my OSM profile here. Haven't been using it for years, but this is a nice opportunity to get back into mapping.
Great to see this project happening and I hope our small but enthusiastic group can contribute to it!