Best of (Ruby) Gems Series - What's Next? What's Hot?

This page summarizes the projects mentioned and recommended in the original post on

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  • gems

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  • torch.rb

    Deep learning for Ruby, powered by LibTorch


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  • numruby

    Fast Numerical Linear Algebra Library for Ruby. NMatrix reimplementation.


  • faiss-ruby

    Efficient similarity search and clustering for Ruby


  • net-ssh

    Pure Ruby implementation of an SSH (protocol 2) client


  • ruby-mqtt

    Pure Ruby gem that implements the MQTT protocol, a lightweight protocol for publish/subscribe messaging.


  • ruby-netsnmp

    SNMP library in ruby (v1, v2c, v3)

    ruby-netsnmp (I'm the maintainer, so free add alert)

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  • bcrypt_pbkdf-ruby

    Ruby gem implementing bcrypt_pbkdf


  • ruby-vips

    Ruby extension for the libvips image processing library.

    A special mention to ruby-vips, which is (along with maybe php, I guess) one of the few language bindings maintained by the author of libvips, which should become the defacto image processing manipulation library.

  • Nokogiri

    Nokogiri (鋸) makes it easy and painless to work with XML and HTML from Ruby.

    About the C-extensions, I'd be curious on what it takes to build extensions using C, and a study around how nokogiri solved the yearlong issue of install-then-compile by shipping arch-based precompiled binaries, and how this should become more of a standard in the ruby community for gems requiring extensions.

  • Async Ruby

    An awesome asynchronous event-driven reactor for Ruby. (by socketry)

    Async (there's a whole ecosystem around it)

  • nio4r

    Cross-platform asynchronous I/O primitives for scalable network clients and servers.


  • EventMachine

    EventMachine: fast, simple event-processing library for Ruby programs


  • Celluloid

    Actor-based concurrent object framework for Ruby


  • Concurrent Ruby

    Modern concurrency tools including agents, futures, promises, thread pools, supervisors, and more. Inspired by Erlang, Clojure, Scala, Go, Java, JavaScript, and classic concurrency patterns.

    Concurrent Ruby

  • Polyphony

    Fine-grained concurrency for Ruby


  • Sequel

    Sequel: The Database Toolkit for Ruby


  • Ruby on Rails

    Ruby on Rails


  • ROM

    Data mapping and persistence toolkit for Ruby

    Ruby Object Mapper

NOTE: The number of mentions on this list indicates mentions on common posts plus user suggested alternatives. Hence, a higher number means a more popular project.

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