The most scalable open-source MQTT broker for IoT, IIoT, and connected vehicles

Erlang/OTP

Robust, Ubiquitous and Massively Scalable Messaging Platform (XMPP, MQTT, SIP Server)

Tsung is a high-performance benchmark framework for various protocols including HTTP, XMPP, LDAP, etc.

Lisp Flavoured Erlang (LFE)

Erlang build tool that makes it easy to compile and test Erlang applications and releases.

Clojure for the Erlang VM (unofficial)

Functional programming inspired by ML for the Erlang VM

Haskell-style functional programming language running on Erlang VM.

The Erlang Language Server

Erlang Style Reviewer

Tree-sitter Grammar for Erlang