KONE: https://dev.kone.com/api-portal/kone-apis

Commerce Cloud: https://developer.commercecloud.com/s/commerce-api-apis

Travelers: https://developer.travelers.com/s/

IP Australia: https://portal.api.ipaustralia.gov.au/s/

Shell: https://developer.shell.com/s/apis

Vocus: https://developer.vocus.com.au/s/

Interesting “DIY” in Drupal: https://apidevelopers.chorus.co.nz/api-explorer