Get a list of orgs which you have been contributed to on GitHub

contributed_orgs.graphql

query($login: String!, $before: String){
  user(login:$login) {
    repositoriesContributedTo(last: 100, before: $before) {
      pageInfo {
        startCursor
        hasPreviousPage
      }
      nodes {
        owner {
          login
        }
        name
      }
    }
  }
}

Use https://developer.github.com/v4/explorer/ to play with it.