TypeKit
Used by 2 peoplefonts.adobe.com ↗

“I prefer Type Cast for deciding on web typography and TypeKit for rendering beautiful fonts on the web.”
Adit Gupta Interview, Founder and CEO (Function Space) · via Uses This 
“I'm co-founder and editor of A Book Apart, a former contributing editor at A List Apart, and communications director at Typekit (recently acquired by Adobe).”
Mandy Brown Interview, Designer, writer, editor (A Book Apart) · via Uses This