No, OpenCore is not a fork of .LRN. Actually, we built the early versions of our LMS on ACS in 2000. We have since migrated to a system that can be operated outside of ACS; however, OpenCore is our attempt to port a version over to OpenACS. Obviously, all of our time is not going into OpenCore development, but my hope is that, in conjunction with Ernie, we can provide the OpenACS community with some valuable tools.