Here is a list of intercountry adoptee led groups who include adoptees of any country of origin, based in receiving (adoptive) countries:
Canada has english language based Out of the Fog podcast based in Montreal covering all adoption co-founded by intercountry adoptee from Ethiopia; AdopteesOn another podcast covering all adoption by domestic adoptee based in Alberta; Adult Adoptee Network is a meet up group (for all adoptees) based in Ontario and Asian Adult Adoptees of British Columbia is a meet up group for Asian adoptees in western Canada.
Denmark has Adoptionspolitisk Forum
Germany has Adoptierte aus aller Welt
New Zealand has I’mAdopted which covers domestic & intercountry but is founded by two intercountry adoptees, one Romanian, the other Russian.
The Netherlands has International Foundation Adoptees (SIG)
The UK has The Transnational & Transracial Adoption Group (TTAG) and Adoption Arena (includes domestic, transracial & intercountry adoption)
The USA has Adoption Museum Project, Transracial Eyes, International-Adopt-Talk, a PodCast compilation of intercountry and transracial adoptee voices at The Rambler and GlobalAdopteeTalk, and an adoptee support group in San Francisco Bay Area run by intercountry adoptees for all adoptees. A couple of proactive platforms that include domestic AND intercountry adoptee experiences is Dear Adoption, Overcoming Odds and I Am Adoptee.
Other organisations based in the USA, who have a special focus:
Adoptionland works to politically draw attention to the human trafficking aspect of intercountry adoption and AdopteeRightsCampaign who actively works to bring about legislative change for the estimated 35,000 intercountry adoptees, who currently have no US citizenship.