Updated
No — TT Commons isn’t listed as a free font. Type Type releases it, so licence options and pricing sit on their site.
TT Commons is a sans-serif typeface from Type Type.
Start with Type Type’s other releases — TT Hoves and TT Interphases Pro. They come from the same studio that drew TT Commons, and A1 has 5 websites using them.
TT Commons™ Classic is a universal sans serif with a minimal contrast of strokes, a closed aperture and geometric shapes of characters. The design of the typeface was developed for the widest possible range of tasks with which any quality corporate font is required to cope.
A1 features 3 websites using TT Commons, including Daylit, Hurry Up & Have Fun, and Plot. They lean towards Sans-serif, Shapes, and Pattern design styles, and they’re most often built with Webflow.