Skylight is a smart profiler for Rails, Sinatra, and other Ruby apps.

Psych is a YAML parser and emitter. Psych leverages libyaml[http://pyyaml.org/wiki/LibYAML] for its YAML parsing and emitting capabilities. In addition to wrapping libyaml, Psych also knows how to serialize and de-serialize most Ruby objects to and from the YAML format.

a fast strptime/strftime engine which uses VM.

Parses SQL queries using a copy of the PostgreSQL server query parser

Simple wrapper around the pHash library

rbnacl with bundled libsodium

Ruby binding for zstd(Zstandard - Fast real-time compression algorithm). See https://github.com/facebook/zstd

ruby-opencv is a wrapper of OpenCV for Ruby. It helps you to write computer vision programs (e.g. detecting faces from pictures) with Ruby.

A Ruby client for the Cassandra distributed database.

A Ruby library for text classification featuring Naive Bayes, LSI (Latent Semantic Indexing), Logistic Regression, and k-Nearest Neighbors classifiers. Includes TF-IDF vectorization, streaming/incremental training, pluggable persistence backends, thread safety, and a native C extension for fast LSI operations.

A fast HTTP / Websocket Server with built-in Pub/Sub support (with or without Redis), static file support and many other features, optimized for Ruby MRI on Linux / BSD / macOS / Windows

A fast HTTP / Websocket Server with built-in Pub/Sub support (with or without Redis), static file support and many other features, optimized for Ruby MRI on Linux / BSD / macOS / Windows

Numo::NArray - New NArray class library in Ruby/Numo.

NMatrix is a linear algebra library for Ruby, written mostly in C and C++.

This is the MySQL API module for Ruby. It provides the same functions for Ruby programs that the MySQL C API provides for C programs. This package is offered as gem for easy installation using RubyGems. It wraps unmodified tmtm's mysql-ruby extension into a proper gem. Please note that tmtm (Tomita Mashahiro) has deprecated development of this extension and only update it for bug fixes.

Counting Bloom Filter implemented in Ruby

Ruby bindings for Lindera, a morphological analysis library for CJK text (Japanese, Korean, Chinese).

Ruby compiler and runtime for the google protocol buffers library.

Expose the bundled libstemmer_c library to Ruby.

Sereal encoder/decoder (https://github.com/Sereal/Sereal)