Founded in 1996, GlobalSign is one of the world's longest-running commercial CAs serving 150+ countries. Offers full SSL/TLS certificates, enterprise managed PKI, IoT device identity, and document signing solutions.
Founded in 1998, Comodo CA (now operating under the Sectigo brand) is a globally recognized SSL certificate authority known for its PositiveSSL and EssentialSSL product lines, issuing over 50,000 certificates daily with industry-leading affordability.
Thawte is a well-known certificate authority founded in 1995 in South Africa, now a DigiCert sub-brand offering full DV/OV/EV SSL and code signing certificates, with OV starting at $80/yr and unique brand heritage in African SSL markets.