5BBC is all free, NYCC is for paid members. Then there are the bigger ones like the three Bike New York rides (5 boro, Twin Lights, Hudson Valley, and I think another out on LI), the TA Century, Glen's rides, and Times-Up have some neat easy rides as well.
NYCC requires membership for their SIG's, but I believe anyone can join one of their group rides. You do need to be a member to see their full ride listing, though most if not all rides for the current week are posted on their home page.