The International Project Management Association (IPMA) certifies organizations and professionals in the domain of Project Management.
Official Web Site: http://www.ipma.world
From the site, "IPMA is an international umbrella organization, or federation of more than 60 national project management associations from all over the World."
Note: Looking for information about how many organizations and individuals are members or certified by this organization. Most of this wiki describes the PMI perspective on project management. IPMA claims that their certification covers more extensive capabilities.