Recurrent neural network for audio noise reduction

https://github.com/xiph/rnnoise

Fast hash map and hash set

https://github.com/Tessil/robin-map

Roboto typeface family

http://developer.android.com/design/style/typography.html

Rocinante is a lightweight configuration management software

https://github.com/bastillebsd/rocinante

Window switcher, run dialog and dmenu replacement

https://github.com/davatorium/rofi

Japanized and message separated version of Rogue-clone: Version II

Fully skinnable XHTML/CSS webmail written in PHP

https://roundcube.net/

Classic skin/theme for Rouncube webmail

https://github.com/roundcube/classic/

Larry skin/theme for Rouncube webmail

https://github.com/roundcube/larry/

Thunderbird Labels plugin for RoundCube webmail

https://github.com/mike-kfed/roundcube-thunderbird_labels

Firmware for RaspberryPi Single Board Computer

https://github.com/raspberrypi/firmware

Convert .rpm files to cpio format

The RPM Package Manager

https://rpm.org/

Round Robin Database Tools

https://oss.oetiker.ch/rrdtool/

Fast spam filtering system

https://rspamd.com/

Restricted Secure SHell only for sftp or/and scp

http://www.pizzashack.org/rssh/index.shtml

Network file distribution/synchronization utility

https://rsync.samba.org/

Syslogd supporting SQL, TCP, and TLS

https://www.rsyslog.com/

Generic RF data receiver and decoder for ISM band devices

https://github.com/merbanan/rtl_433

Command-line tool that performs SDR with RTL2832-based USB sticks

https://sdr.osmocom.org/trac/wiki/rtl-sdr

Realtek USB bluetooth adaptor firmwares used by rtlbtfw(8)

https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git

Open-source C implementation of the RPKI/Router Protocol client

https://rtrlib.realmv6.org/

Ruby interface to Oracle Berkeley DB revision 2 or later

https://github.com/knu/ruby-bdb

Integrated environment for Bioinformatics written in Ruby

http://bioruby.org/

Binary search library for Ruby

http://0xcc.net/ruby-bsearch/

Package management framework for the Ruby language

https://rubygems.org/ https://github.com/rubygems/rubygems

Romaji <-> Kana conversion library for Ruby

http://0xcc.net/ruby-romkan/index.html.en

Unicode conversion library with Japanese codesets support for Ruby

http://www.yoshidam.net/Ruby.html

Ruby binding for Xapian

https://xapian.org/

Object-oriented interpreted scripting language

https://www.ruby-lang.org/en/

Object-oriented interpreted scripting language

https://www.ruby-lang.org/en/

Easy email delivery and testing for Ruby

https://rubyonrails.org/ https://github.com/rails/rails/tree/main/actionmailer

Action Controller and Action View of Rails MVC Framework

https://rubyonrails.org/ https://github.com/rails/rails/tree/main/actionpack

Rendering framework putting the V in MVC (part of Rails)

https://rubyonrails.org/ https://github.com/rails/rails/tree/main/actionview

Job class declarations for a variety of queueing backends

https://rubyonrails.org/ https://github.com/rails/rails/tree/main/activejob

Toolkit for building modeling frameworks

https://rubyonrails.org/ https://github.com/rails/rails/tree/main/activemodel

Toolkit for building modeling frameworks

https://rubyonrails.org/ https://github.com/rails/rails/tree/main/activemodel

Bulk import many records into an ActiveRecord DB

https://github.com/zdennis/activerecord-import

Object-relational mapping layer for Rails MVC Framework

https://rubyonrails.org/ https://github.com/rails/rails/tree/main/activerecord

Object-relational mapping layer for Rails MVC Framework

https://rubyonrails.org/ https://github.com/rails/rails/tree/main/activerecord

Toolkit of support libraries and Ruby core extensions extracted from the Rails framework

https://github.com/rails/rails/tree/main/activesupport https://rubyonrails.org/

Utility classes and extension that are required by Rails MVC Framework

https://rubyonrails.org/ https://github.com/rails/rails/tree/main/activesupport

Utility classes and extension that are required by Rails MVC Framework

https://rubyonrails.org/ https://github.com/rails/rails/tree/main/activesupport

Replacement for the URI implementation

https://github.com/sporkmonger/addressable

Ruby implementation of AES Key Wrap

https://github.com/tomdalling/aes_key_wrap

Relational Algebra for Ruby

https://github.com/rails/arel

Relational Algebra for Ruby

https://github.com/rails/arel

Fast, open source text processor and publishing toolchain

https://asciidoctor.org/

Library for working with Abstract Syntax Trees

https://github.com/whitequark/ast

Ruby implementations of attr_required and attr_optional

https://github.com/nov/attr_required