Welcoming Repositories Index Erlang Ecosystem
Top Welcoming Open-Source Erlang Repositories
Top welcoming Erlang repositories. Scored by real 90-day external PR merge rates, maintainer review turnaround speed, and first-time contributor success.
Updated daily • Sun, 30 Aug 2026 UTC
Tracked Repos
137
>100 stars verified
Avg Merge Rate
15%
90-day external PRs
Open GFIs
0
Beginner friendly issues
Welcoming Tier
7
S & A Tier maintainers
Ranked Erlang Repositories
Showing top 50 of 137 ranked repositories
| Rank | Repository | Tier | Score | Merge Rate | Good First Issues |
|---|---|---|---|---|---|
| #1 | emqx/emqx16,670 The most scalable and reliable MQTT broker for AI, IoT, IIoT and connected vehicles | S•Elite | 73.3 | 84.2% | - |
| #2 | Running Elixir in the browser | S•Elite | 73.2 | 92.7% | - |
| #3 | Zotonic - The Erlang Web Framework & CMS | A•Welcoming | 65.9 | 95.5% | - |
| #4 | esl/MongooseIM1,749 MongooseIM is Erlang Solutions' robust, scalable and efficient XMPP server, aimed at large installations. Specifically designed for enterprise purposes, it is fault-tolerant and can utilise the resources of multiple clustered machines. | A•Welcoming | 65.4 | 80.0% | - |
| #5 | processone/ejabberd6,717 Robust, Ubiquitous and Massively Scalable Messaging Platform (XMPP, MQTT, SIP Server) | A•Welcoming | 62.9 | 100.0% | - |
| #6 | rabbitmq/ra958 A Multi-Raft implementation for Erlang and Elixir that strives to be efficient and make it easier to use multiple Raft clusters in a single system. | B•Solid | 58.0 | 100.0% | - |
| #7 | Chef Infra Server is a hub for configuration data; storing cookbooks, node policies and metadata of managed nodes. | A•Welcoming | 57.4 | 75.0% | - |
| #8 | erlang/otp12,323 Erlang/OTP | A•Welcoming | 56.0 | 51.4% | - |
| #9 | Khepri is a tree-like replicated on-disk database library for Erlang and Elixir. | B•Solid | 49.5 | 50.0% | - |
| #10 | An Erlang implementation of RAFT from WhatsApp | D•Risky | 8.0 | 0.0% | - |
| #11 | apache/couchdb6,939 Seamless multi-primary syncing database with an intuitive HTTP/JSON API, designed for reliability | D•Risky | 0.0 | 0.0% | - |
| #12 | alpaca-lang/alpaca1,466 Functional programming inspired by ML for the Erlang VM | D•Risky | 0.0 | 0.0% | - |
| #13 | 2600hz/kazoo988 The core of an open-source, distributed, highly scalable platform designed to provide robust telecom services | D•Risky | 0.0 | 0.0% | - |
| #14 | Nitrogen Web Framework for Erlang (now with websockets!) | D•Risky | 0.0 | 0.0% | - |
| #15 | High performance Erlang MTProto proxy that powers https://t.me/socksy_bot | D•Risky | 0.0 | 0.0% | - |
| #16 | Apache Kafka client library for Erlang/Elixir | D•Risky | 0.0 | 0.0% | - |
| #17 | DNS server, in Erlang. | D•Risky | 0.0 | 0.0% | - |
| #18 | joxa/joxa473 A Modern Lisp for the Erlang VM | D•Risky | 0.0 | 0.0% | - |
| #19 | An automated code formatter for Erlang | D•Risky | 0.0 | 0.0% | - |
| #20 | The official "Erlang and OTP in Action" source code - see the README below for more details | D•Risky | 0.0 | 0.0% | - |
| #21 | Erlang PostgreSQL client library. | D•Risky | 0.0 | 0.0% | - |
| #22 | Erlang performance and debugging tools | D•Risky | 0.0 | 0.0% | - |
| #23 | emqx/emqtt439 Erlang MQTT 5.0 Client | D•Risky | 0.0 | 0.0% | - |
| #24 | inaka/elvis435 Erlang Style Reviewer | D•Risky | 0.0 | 0.0% | - |
| #25 | A Cloud at the lowest level! | D•Risky | 0.0 | 0.0% | - |
| #26 | OpenTelemetry Erlang SDK | D•Risky | 0.0 | 0.0% | - |
| #27 | Prolog interpreter in and for Erlang | D•Risky | 0.0 | 0.0% | - |
| #28 | Utilities to manipulate Elixir source code | D•Risky | 0.0 | 0.0% | - |
| #29 | MySQL/OTP – MySQL and MariaDB client for Erlang/OTP | D•Risky | 0.0 | 0.0% | - |
| #30 | Apple Push Notification Server for Erlang | D•Risky | 0.0 | 0.0% | - |
| #31 | D•Risky | 0.0 | 0.0% | - | |
| #32 | Prometheus.io client in Erlang | D•Risky | 0.0 | 0.0% | - |
| #33 | MongoDB driver for Erlang | D•Risky | 0.0 | 0.0% | - |
| #34 | Concuerror is a stateless model checking tool for Erlang programs. | D•Risky | 0.0 | 0.0% | - |
| #35 | The Erlang REST framework | D•Risky | 0.0 | 0.0% | - |
| #36 | Simple, robust and performant Erlang web server | D•Risky | 0.0 | 0.0% | - |
| #37 | JSON Object Signing and Encryption (JOSE) for Erlang and Elixir | D•Risky | 0.0 | 0.0% | - |
| #38 | Курс обучения Эрланг | D•Risky | 0.0 | 0.0% | - |
| #39 | uwiger/jobs331 Job scheduler for load regulation | D•Risky | 0.0 | 0.0% | - |
| #40 | 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, distribuited and highly configurable web cawler. See wiki pages for more details | D•Risky | 0.0 | 0.0% | - |
| #41 | ferd/pobox325 External buffer processes to protect against mailbox overflow in Erlang | D•Risky | 0.0 | 0.0% | - |
| #42 | grisp/grisp323 🐟 GRiSP Erlang Runtime Library | D•Risky | 0.0 | 0.0% | - |
| #43 | qiniu/qetag319 qetag | D•Risky | 0.0 | 0.0% | - |
| #44 | An OTP Process Pool Application | D•Risky | 0.0 | 0.0% | - |
| #45 | Erlang Patterns of Concurrency | D•Risky | 0.0 | 0.0% | - |
| #46 | The Riak client for Erlang. | D•Risky | 0.0 | 0.0% | - |
| #47 | A framework for processing email using worker plugins. | D•Risky | 0.0 | 0.0% | - |
| #48 | Erlang library and packrat parser-generator for parsing expression grammars. | D•Risky | 0.0 | 0.0% | - |
| #49 | Erlang Orleans | D•Risky | 0.0 | 0.0% | - |
| #50 | Web framework for the BEAM — Erlang, Elixir, and LFE | D•Risky | 0.0 | 0.0% | - |
How to Get Your Erlang PR Merged
1
Check C-Rank™ First: Pick projects with S or A tiers to avoid maintainer ghosts and slow review cycles.
2
Run Local Verification: Ensure test suites and formatting linters pass before opening a pull request.
3
Submit in Maintainer Windows: Check the repository report card to submit when maintainers are most active.
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Frequently Asked Questions: Erlang Open Source
What is the most welcoming Erlang open-source repository?
The highest-ranked Erlang repository on GetMerged is currently emqx/emqx, with a C-Rank score of 73.3/100 and a 84.2% PR merge rate.
How can I find good first issues in Erlang?
You can browse verified beginner-friendly issues in Erlang by visiting our curated Good First Issues directory at getmerged.abhishekco.de/good-first-issue/erlang.
What makes a Erlang repository ‘Super Welcoming’ on GetMerged?
A ‘Super Welcoming’ (S-Tier) Erlang repository demonstrates an external PR merge rate above 80%, a median first response time within 24 to 48 hours, active review feedback, and clear onboarding documentation.