The ACLS Workbench is a platform powered by Scalar for the creation and publication of born-digital collaborative projects (“books”) in critical code studies. It has four main features: users can view, clone, join, or create a book. In addition to Scalar’s standard multimedia features, the ACLS Workbench allows users to annotate source code. More information is available here.
P.S. Another interesting thing I found is a book called 10 PRINT CHR$(205.5+RND(1)); : GOTO 10. According to the website, “this book takes a single line of code—the extremely concise BASIC program for the Commodore 64 inscribed in the title—and uses it as a lens through which to consider the phenomenon of creative computing and the way computer programs exist in culture.” If you go to the book’s website you can find links to purchase the book, as well as a free PDF provided under a Creative Commons license.
