After 23 years online, I am suspicious of anonymity online. Normally I don't deal with or recommend sites that don't disclose their ownership. That said, the mysterious website geologydegree.org has gone to the trouble of compiling a very good list called Geology Online: 105 Sites that Rock. What I like about it is its wide range, which includes corporate, governmental, academic and personal sites. I saw quite a few sites I didn't know about before, and I imagine you'll have the same experience.