@syntax Yet another service, I'm not aware of. :-)
@keyoxide - feel free to replace Gravatar with Libravatar. If you do not want to go the full route and implement the federated API, it's a drop in replacement.
Yes, currently a bit slower than Gravatar, but we're working on that. It's mostly a hardware resource issue ATM.
I will include an option for people to set their avatar source to libravatar. I'll more than gladly drop gravatar but will do so when libravatar becomes more reliable as a service. Looking forward to that day!