Here is a list of intercountry adoptee led groups who include adoptees of any country of origin, based in receiving countries:
Canada has L’Hybride , RAIS both in Montreal and Asian Adult Adoptees of British Columbia in western Canada; Out of the Fog is a podcast that covers all adoption (intercountry & domestic) but co-founded by intercountry adoptee from Ethiopia; The Colours of Adoption is a book project founded to bring together an intercountry adoption anthology.
Denmark has Adoptionspolitisk Forum
New Zealand has I’mAdopted which covers domestic & intercountry but is founded by two Romanian intercountry adoptees.
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. 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.