ejabberd is a distributed, fault-tolerant technology that allows the creation of large-scale instant messaging applications. The server can reliably support thousands of simultaneous users on a single node and has been designed to provide exceptional standards of fault tolerance. As an open source technology, based on industry-standards, ejabberd can be used to build bespoke solutions very cost effectively.

ejabberd - Robust, Scalable and Extensible XMPP Server

RabbitMQ is a messaging broker - an intermediary for messaging. It gives your applications a common platform to send and receive messages, and your messages a safe place to live until received. It features include reliability, high availability, Clustering and Federation. RabbitMQ ships with an easy-to use management UI that allows you to monitor and control every aspect of your message broker. There are RabbitMQ clients for almost any language you can think of. 

RabbitMQ - Robust messaging for applications

ActorDB is ideal as a server side database for apps. Think of running a large mail service, dropbox, evernote, etc. They all require server side storage for user data, but the vast majority of queries is within a specific user. With many users, the server side database can get very large. Using ActorDB you can keep a full relational database for every user and not be forced into painful scaling strategies that require you to throw away everything that makes relational databases good.
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ActorDB is
<ul>
<li>A distributed relational SQL database.</li>
<li>Consistent (not eventually consistent).</li>
<li>Distributed.</li>
<li>Redundant.</li>
<li>Massively concurrent.</li>
<li>No single point of failure.</li>
<li>ACID.</li>
<li>Connectable over MySQL protocol and <a href="https://github.com/biokoda/actordb/blob/master/adbt.thrift">Thrift</a>.</li>
<li>Replicated safely using the Raft distributed consensus algorithm.</li>
</ul>

ActorDB is ideal as a server side database for apps. Think of running a large mail service, dropbox, evernote, etc. They all require server side storage for user data, but the vast majority of queries is within a specific user. With many users, the server side database can get very large. Using ActorDB you can keep a full relational database for every user and not be forced into painful scaling strategies that require you to throw away everything that makes relational databases good.

ActorDB -  Distributed SQL database with linear scalability 

MongooseIM is aimed at large, complex enterprise level projects where real-time communication is critical for business success. It provides high availability, ease of deployment, development and reliability in production. MongooseIM can accept client sessions over vanilla XMPP, Websockets, and HTTP long-polling (a.k.a. BOSH).

MongooseIM - Efficient XMPP server

Apache CouchDB is a document-oriented database that can be queried and indexed in a MapReduce fashion using JavaScript. CouchDB also offers incremental replication with bi-directional conflict detection and resolution. CouchDB provides a RESTful JSON API than can be accessed from any environment that allows HTTP requests. There are myriad third-party client libraries that make this even easier from your programming language of choice. CouchDB’s built in Web administration console speaks directly to the database using HTTP requests issued from your browser.

Apache CouchDB is a document-oriented database that can be queried and indexed in a MapReduce fashion using JavaScript. CouchDB also offers incremental replication with bi-directional conflict detection and resolution.

CouchDB - A Database for the Web

DalmatinerDB is a metric database written in pure Erlang. It takes advantage of some special properties of metrics to make some tradeoffs. Its goal is to make a store for metric data (time, value of a metric) that is fast, has a low overhead, and is easy to query and manage. DalmatinerDB allows for metric input in second or even sub-second precision. It will interpolate the missing values to the best of it’s abilities. This is usually acceptable for aggregated data.
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DalmatinerDB is designed to run on ZFS file system and it relies heavily on taking advantage of ZFS facilities such as the ARC, ZIL, checksums and volume compression. The frontend servers give users access to a rich SQL-like query language that's easy to use for both dev and ops. It integrates nicely with Grafana making it easy to build beautiful dashboards.

DalmatinerDB is a metric database written in pure Erlang. It takes advantage of some special properties of metrics to make some tradeoffs. Its goal is to make a store for metric data (time, value of a metric) that is fast, has a low overhead, and is easy to query and manage. DalmatinerDB allows for metric input in second or even sub-second precision. It will interpolate the missing values to the best of it’s abilities. This is usually acceptable for aggregated data.

DalmatinerDB - Fast distributed metrics database in Erlang

GeoCouch is a spatial extension for Couchbase and Apache CouchDB.This version of GeoCouch needs at least Apache CouchDB 1.3.x.

GeoCouch - A spatial index for CouchDB

Tsung is an open-source multi-protocol distributed load testing tool. It can be used to stress HTTP, WebDAV, SOAP, PostgreSQL, MySQL, LDAP and Jabber/XMPP servers.  The purpose of Tsung is to simulate users in order to test the scalability and performance of IP based client/server applications. You can use it to do load and stress testing of your servers. Many protocols have been implemented and tested, and it can be easily extended. 

Tsung - Distributed Load Testing Tool

asdf is a CLI tool that can manage multiple language runtime versions on a per-project basis. It is like gvm, nvm, rbenv & pyenv (and more) all in one! Simply install your language's plugin!

asdf - Manage multiple runtime versions with a single CLI tool, extendable via plugins

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