Certum is a Polish Certificate Authority under Asseco Data Systems, founded 2002 in Poznań, Poland — one of few European CAs with its own trusted root — providing affordable SSL/TLS certificates, code signing, and eIDAS-qualified digital signatures.
SSLS (SSL.com) is a US-based certificate authority with its own root infrastructure, offering DV/OV/EV SSL/TLS, code signing, document signing, and email certificates with ACME automation and a Chinese management panel — at 30%-50% below top-tier CA pricing.
SSL.com is a Houston Texas-based Certificate Authority founded in 2002, offering affordable DV/OV/EV SSL certificates from $39.95/yr, S/MIME, code signing, and enterprise PKI solutions.
Founded in 2003, CAcert is a community-driven open-source certificate authority offering free SSL/TLS server certificates, code signing certificates, and email certificates with fully transparent operations.