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: Asian Adoptees Canada, Transracial Adoptee Community of BC (TAC, in British Columbia), Adult Adoptee Network is a meet up group (for all adoptees) based in Ontario, Subtle Asian Adoptee Traits (SAAT Canada).
Other organisations based in Canada run by intercountry adoptees who have a special focus:
Colours of Adoption is a Montreal book project founded to bring together an intercountry adoption anthology in French.
Out of the Fog is a podcast co-created by Ethiopian adoptee.
Adoptees On is a podcast and source of many adoption support resources by domestic adoptee.
A special focus group for Truth & Reconciliation about intercountry adoption in Europe is United European Adoptees (UEA), Subtle Asian Adoptee Traits (SAAT) Europe, Critical Adoptees Front Europe (CAFE).
Finland has Vuxna Internationellt Adopterade i Finland (VIA)
Germany has Adoptierte aus aller Welt
Spain has La voz de los adoptados
Adoptee led orgs with resource info but no longer active: Adoption Museum Project, Transracial Eyes, International-Adopt-Talk, The Adoptee Group, Unite Our Dream, People for Ethical Adoption Reform (PEAR), Yeondae, San Francisco Bay Area; Dear Adoption, Adoptee Rights Campaign (ARC), AQA (Asian, African, Aborigine/Autochtones Queer Adoptees)