ruby-prof is a fast code profiler for Ruby. It is a C extension and therefore is many times faster than the standard Ruby profiler. It supports both flat and graph profiles. For each method, graph profiles show how long the method ran, which methods called it and which methods it called. RubyProf generate both text and html and can output it to standard out or to a file.

Distributes the V8 JavaScript engine in binary and source forms in order to support fast builds of The Ruby Racer

Ruby wrapper for hiredis (protocol serialization/deserialization and blocking I/O)

charlock_holmes provides binary and text detection as well as text transcoding using libicu

A suite of instrumentation metric primitives that can be exposed through a web services interface.

A fast, safe, extensible parser for CommonMark. This wraps the comrak Rust crate.

A focused and fast library to gather memory, cpu, network, load avg and disk information

CBOR is a library for the CBOR binary object representation format, based on Sadayuki Furuhashi's MessagePack library.

bcrypt() is a sophisticated and secure hash algorithm designed by The OpenBSD project for hashing passwords. The bcrypt Ruby gem provides a simple wrapper for safely handling passwords.

This gem implements bcrypt_pbkdf (a variant of PBKDF2 with bcrypt-based PRF)

Provides a C-optimized method for determining if a string is blank

A fast and very smart autolinking library that acts as a drop-in replacement for Rails `auto_link`

High Performance Haml Implementation

implementation of murmur3 hashing function

RGeo is a geospatial data library for Ruby. It provides an implementation of the Open Geospatial Consortium's Simple Features Specification, used by most standard spatial/geographic data storage systems such as PostGIS. A number of add-on modules are also available to help with writing location-based applications using Ruby-based frameworks such as Ruby On Rails.

A framework to implement robust multiprocess servers like Unicorn

Oga is an XML/HTML parser written in Ruby.

Minimal embedded v8 engine for Ruby

iStats is a command-line tool that allows you to easily grab the CPU temperature, fan speeds and battery information on macOS.

Ruby bindings to RE2, "a fast, safe, thread-friendly alternative to backtracking regular expression engines like those used in PCRE, Perl, and Python".