Game Pick. We use CBSSports for our office one.
Probably requires to sign up and that's something that not everybody likes. Last year's fantasy football league didn't garner much interest and despite a proper setup for discussion on the NFL.com website, there was barely any discussion. Being a different website also meant that participation was more inconsistent than here.
If you want to give CBS Sports a try, you can make the setup and I'll add a link and the necessary information to the OP. I am not sure if I will participate, but we have a full month to gauge interest from the community.