I’ve just saw that the @edx fork of the Free Text Response is being actively developed. I’m a bit surprised since I don’t think it’s something that it’s being used at edX.
Traditionally anything that’s forked by edX makes it the de-factor upstream that few can “swim” against.
I don’t know whether edX is using the block. The changes in that repo look like the sort of maintenance changes that are being made across the entire edX GitHub organization. Perhaps @stv can tell us more?
We will or have deployed the blocks required for hosting Stanford courses on edx.org. Stv, I believe, has the best knowledge of the specifics here. Not sure what the plans is vis-a-vis, declaring the edX version as the canonical upstream.