Yes — Crimson is free to download from Google Fonts. Read the licence it ships with before you use it in client work.
Crimson Pro is a serif typeface family: Contemporary, clear, classic and rounded/open. Something for a college textbook, editorial websites and any reading experience with book-length texts It contributes to the tradition of beautiful Garamond-inspired typefaces, often called “Garalde” or “Old Style,” and has 8 named weights, in Roman and Italic, and is available as a Variable Font with a Weight axis.
A1 features 5 websites using Crimson, including Uttkarsh Mandaknale, Roomie, and Allier Ho. They lean towards Minimal, Photography, and Serif design styles, and they’re most often built with Framer.