Big Book of R

I've made some half-hearted attempts to build something like this and I'm glad to see someone tried harder than I did. Thanks!

One comment: it would be good to distinguish between books that are free and books that you have to pay for.

Thanks! Paid books do note (above the link) that they're paid but I agree, a better visual might help. I'm thinking of removing the paid books where many free alternatives are available