barrel_tcp is a generic TCP acceptor pool with low latency in Erlang.
ENet implementation in Erlang/OTP
DNS server, in Erlang.
A scalable RPC library for Erlang-VM based languages
Generic TCP Server for Erlang applications
Gossip middleware in Erlang
HTTP/HTTPS/Socks4/Socks5 proxy written in Erlang
Erlang library to map your internal port to an external using UNP IGD
QUIC protocol for Erlang & Elixir
Tsung is a high-performance benchmark framework for various protocols including HTTP, XMPP, LDAP, etc.