Updated
No — Marfa isn’t listed as a free font. Dinamo releases it, so licence options and pricing sit on their site.
Marfa is a serif typeface from Dinamo.
Start with Dinamo’s other releases — Arizona, Oracle, and Marist. They come from the same studio that drew Marfa, and A1 has 17 websites using them.
While stylistically born in the hot metal typesetting period, Marfa was designed in a high-speed era of no time to lose: Its uprights were drawn in under 1,000 hours and its hot-headed Italics in less than half of that. Initially, Marfa was a sturdy, utilitarian typeface of three modest weights known as Gothic No. 6, drawn by Fabian Harb in homage to early American gothic typefaces.
A1 features 1 website using Marfa. It leans towards Interactive, Hand-drawn, and Stickers design styles.