DigiCert secures the websites, data, and applications of the world’s top companies. DigiCert delivers the highest security standards to protect your business.
The combination of Thawte SSL certificates and uncompromised infrastructure and world-class customer service make Thawte good choice for online protection.
GeoTrust is one of the oldest and proven SSL certificates vendor. World class SSL certificates are the highest security guarantees for your online business regardless of its size.
UPDATE: 7/24/17, After Comodo received many claims, they decided to pause new updates. All Wildcard SSL still have protection of base domain and all single domain SSL secures both with/without WWW.