OpenURI with transparent disk caching

https://github.com/tigris/open-uri-cached

Open4 manages child processes and their io handles

https://github.com/ahoward/open4

OpenGL wrapper for Ruby

https://github.com/larskanis/opengl

OpenID Connect Server & Client Library

https://github.com/nov/openid_connect

Libraries needed to talk to OpenNebula

https://opennebula.io/ https://github.com/OpenNebula/one

Wrap the OpenSSL library

https://github.com/ruby/openssl

Implementation of RFC 3610 - Counter with CBC-MAC (CCM)

https://github.com/SmallLars/openssl-ccm

Implementation of RFC 4493, 4494, 4615 - AES-CMAC Algorithm

https://github.com/SmallLars/openssl-cmac

ECDSA, RSA-PSS and RSA-PKCS for ruby

https://github.com/cedarcode/openssl-signature_algorithm

Wrap the OpenSSL library

https://github.com/ruby/openssl

Stats collection and distributed tracing framework

https://opentelemetry.io/ https://github.com/open-telemetry/opentelemetry-ruby/tree/main/api https://github.com/open-telemetry/opentelemetry-ruby

Common helpers for OpenTelemetry

https://opentelemetry.io/ https://github.com/open-telemetry/opentelemetry-ruby/tree/main/common https://github.com/open-telemetry/opentelemetry-ruby

SQL helpers for the OpenTelemetry framework

https://opentelemetry.io/ https://github.com/open-telemetry/opentelemetry-ruby-contrib/tree/main/helpers/sql https://github.com/open-telemetry/opentelemetry-ruby-contrib

Registry for the OpenTelemetry Instrumentation libraries

https://opentelemetry.io/ https://github.com/open-telemetry/opentelemetry-ruby/tree/main/registry https://github.com/open-telemetry/opentelemetry-ruby

Semantic Convention definitions for OpenTelemetry

https://opentelemetry.io/ https://github.com/open-telemetry/opentelemetry-ruby/tree/main/semantic_conventions https://github.com/open-telemetry/opentelemetry-ruby

OpenTracing Ruby Platform API

https://github.com/opentracing/opentracing-ruby

Command-line option parser for Ruby

https://www.manageiq.org/optimist/ https://github.com/ManageIQ/optimist

Client library for Puppet orchestration services

https://github.com/puppetlabs/orchestrator_client-ruby

Org mode parser written in Ruby

https://github.com/wallyqs/org-ruby

Provides a single point of entry for using basic features of ruby ORMs

https://github.com/ianwhite/orm_adapter

Allows for some useful and easy functions

https://github.com/rdp/os

Class to build custom data structures, similar to a Hash

https://github.com/ruby/ostruct

Mid-level packet manipulation library for Ruby

https://github.com/packetfu/packetfu

Network packet manipulation library

https://github.com/lemontree55/packetgen

Run any kind of code in parallel processes

https://github.com/grosser/parallel

Soft deletion mapper for activerecord

https://github.com/rubysherpas/paranoia

Parse cron expressions and calculates the next occurence

https://github.com/siebertm/parse-cron

Ruby parser written in pure Ruby

https://github.com/whitequark/parser

Parser construction library with great error reporting in Ruby

https://kschiess.github.io/parslet/

Terminal strings styling with intuitive and clean API

https://github.com/piotrmurach/pastel

Representation of the name of a file or directory on the filesystem

https://github.com/ruby/pathname

Ruby HTTP client library based on libcurl

https://toland.github.io/patron/ https://github.com/toland/patron

Libpcap bindings for ruby

https://github.com/shadowbq/pcaprub

Ruby library to render PDF documents

https://prawnpdf.org/ https://github.com/prawnpdf/pdf-core

Ruby library to render PDF documents

https://prawnpdf.org/ https://github.com/prawnpdf/pdf-core

Ruby interface to PostgreSQL library

https://github.com/ged/ruby-pg

Ruby interface to PostgreSQL library

https://github.com/ged/ruby-pg

Fast PostreSQL array parsing

https://github.com/dockyard/pg_array_parser

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

https://github.com/lfittl/pg_query

Performance dashboard for Postgres

https://github.com/ankane/pghero

Performance dashboard for Postgres

https://github.com/ankane/pghero

pkg-config implementation for Ruby

https://github.com/ruby-gnome/pkg-config

Simple Ruby client library for PuppetDB API

https://rubygems.org/gems/pl-puppetdb-ruby

All-purpose Property List manipulation library

https://github.com/patsplat/plist

Almost-pure-ruby PNG library

https://www.zenspider.com/projects/png.html https://github.com/seattlerb/png

Provides a registry of file types

https://github.com/cjheath/polyglot

PostgreSQL data types extension for ActiveRecord

https://github.com/dockyard/postgres_ext

Fast, tiny, and nimble PDF generator for Ruby

https://prawnpdf.org/ https://github.com/prawnpdf/prawn

Fast, tiny, and nimble PDF generator for Ruby

https://prawnpdf.org/ https://github.com/prawnpdf/prawn

Prime numbers and factorization library

https://github.com/ruby/prime