These are the XSLT 2.0 stylesheets for DocBook. These stylesheets represent a different line of development from the XSLT 1.0 stylesheets maintained at SourceForge.net.
That said, they are clearly derived from that work, so tip o' the hat to everyone who's helped over there. And a special nod to Jirka Kosek who did a lot of work on the XSLT 2.0 FO stylesheets.
Although I've been using the 2.0 stylesheets almost exclusively for more than a year, they have only very recently had any sort of public release. There are probably bugs.
Releases are published at docbook.github.com.
Resources (CSS, JavaScript, images, etc.) are maintained in a separate repository.
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