AlphaSSL is GlobalSign's entry-level SSL certificate brand, providing DV and OV certificates backed by GlobalSign's root trust, with prices from $49.95/year for fast HTTPS deployment.
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.
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.
RapidSSL is DigiCert's most affordable entry-level SSL brand, with base DV certificates from $8/yr, supporting one-click 5-10 minute auto-validation via DigiCert's trusted root chain, ideal for personal websites and dev/test environments needing basic HTTPS encryption.
Comodo SSL is a globally recognized budget SSL certificate brand whose CA business merged into Sectigo, with over 100 million certificates issued and PositiveSSL DV from $5/year.
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.