Yeah, and it's actively maintained and actively used. The mailing list
is active as well and Hans Boehm has been very helpful answering my
questions. Also, it's ported to a wide range of platforms, it's highly
tuned, it's designed to live with and take advantage of preemptive
multithreading, etc. It's the result of a decade of design and
implementation work, as can be seen from
http://www.hpl.hp.com/personal/Hans_Boehm/gc/ .
I believe we would never have sufficient manpower to compete with it
(and it seems that most other language runtime implementors arrived to
the same conclusion).