Hey HN! I'm looking to compile a list of interesting and useful protocols that would be good to be aware of as software developer.<p>Secondary goal is to find ideas for clients, and proofs of concepts to implement on niche languages. For example some that I have added to the list already<p>- DNS
- SMTP
- Scalar
- Redis Protocol
- gRPC<p>What else is out there that is interesting or could be fun to implement from scratch?