CakeDC http://www.cakedc.com/
LinkedIn https://www.linkedin.com/groups/4623165
Guru https://www.guru.com/d/freelancers/q/cakephp/
Toptal https://www.toptal.com/cakephp
Truelancer https://www.truelancer.com/cakephp-freelancers
Freelancermap https://www.freelancermap.com/freelancers-directory/cakephp-3383
Fiverr https://www.fiverr.com/search/gigs?query=cakephp
FreelancerMax https://www.freelancermax.com/hire/freelance-cakephp
Malt https://www.malt.com/a/freelance/developers/backend-developer/cakephp-developer
XING (Mostly German) https://www.xing.com/communities/groups/cakephp-the-rapid-php-development-framework-0a9b-1013723
404Works (French) https://www.404works.com/tag/cakephp
Decided to remove https://www.freelancer.com/find/CakePHP as it is not a list but a form to put up a job/project ad.