List Org Repos and Contributors

Get-GitHubRepos.ps1

$org = "Your Org"
$api_key = "Your PAT"

function Get-GitHubApi(){
  param($Url)
  $Headers = @{Authorization = "Bearer $api_key"}
  $wr = Invoke-WebRequest -UseBasicParsing -Headers $Headers $Url
  $wr.Content | ConvertFrom-Json -Depth 100
  if([string]($wr.Headers.link -split "," -match 'rel="next"') -match "https[^>]+"){
    Get-GitHubApi $matches[0]
  }
}

$repos = Get-GitHubApi "https://api.github.com/orgs/$org/repos"

$repos | ForEach-Object {
  $full_name = $_.full_name
  $html_url = $_.html_url
  $contributors = Get-GitHubApi "https://api.github.com/repos/$full_name/contributors"
  $contributors_list = $contributors.login -join ', '
  [PSCustomObject]@{
    Url = $html_url
    Contributors = $contributors_list
  }
}