Sertifier - Best way to send smart certificates & open badges!
Certificado - Issue blockchain-powered certificates for any type of data
Certificates by Graphy - Certificates by Graphy lets you share beautiful custom certificates to all your learners at once.
Bitproof - True certification in the bitcoin blockchain
Certopus - Design & Deliver verifiable certificates
0xcert - Your ID, degree or house. 0xcert-ified on the blockchain