Open source RabbitMQ: core server and tier 1 (built-in) plugins

Comprehensive Aerospike client for Erlang

Clone of http://code.google.com/p/leveldb/

Make it easy to use SOAP from Erlang

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

Erlang MQTT 5.0 Client

AMQP erlang client wrapper library using the RabbitMQ libraries

Sample of AMQP dispatcher and client

Ebot, an Opensource Web Crawler built on top of a nosql database (apache couchdb, riak), AMQP database (rabbitmq), webmachine and mochiweb. Ebot is written in Erlang and it is a very scalable, dist…

CloudI Process Groups

Erlang Unix socket interface

Erlang Crashdump Analysis Library

Cassandra native protocol CQL client for Erlang

Build Erlang apps/deps faster

Erlang interface to low level socket operations

Catalyst IT Ltd's Erlang SMS Routing and Messaging system

MQTT library for Erlang *JUST USABLE*

A very simple example of implementing a structured P2P network (DHT) in Erlang.

Fast performance metrics for Erlang

Erlang RRDTool library

Generic XMPP client framework for Erlang

An erlang interface to rrdtool

Erlang/OTP Node Monitoring

Erlang performance and debugging tools

zMQ implemented in Erlang

Nagios plugins for monitoring Erlang process groups/applications/nodes/etc

Active development for Erlang: rebuild and reload source/binary files while the VM is running

A Google Protobuf implementation for Erlang

Erlang package maker

Send collectd statistics from your Erlang applications