If making a Friendly AI is compared to landing on the moon, I'd say OpenCog is something like the scaffolding for a backyard rocket. It still needs something extra - the rocket - and even then it won't achieve escape velocity. But a radically scaled-up version of OpenCog - with a lot more theory behind it, and tailored to run at the level of a whole data center rather than on a single PC - is the sort of toolset that could make a singularity.