Utility and library for computing and checking of file hashes

https://rhash.sourceforge.net/

Audio player for GNOME

https://wiki.gnome.org/Apps/Rhythmbox

Command line search tool

http://blog.burntsushi.net/ripgrep/

GNU Compiler Collection for bare metal riscv64 cross-development

https://gcc.gnu.org/

Image viewer with Xfce integration

https://goodies.xfce.org/projects/applications/ristretto

Flexible message logging facility for C++

https://www.arg0.net/rlog

Recurrent neural network for audio noise reduction

https://github.com/xiph/rnnoise

Roboto typeface family

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

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

RTMP streams download utility

http://rtmpdump.mplayerhq.hu/

BitTorrent Client written in C++

https://github.com/rakshasa/rtorrent

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 data dumper module for Ruby

http://www.geocities.co.jp/SiliconValley-Oakland/2986/

Package management framework for the Ruby language

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

Object-oriented interpreted scripting language

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

Object-oriented interpreted scripting language

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

Object-oriented interpreted scripting language

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

Fast, open source text processor and publishing toolchain

https://asciidoctor.org/

Ruby extension for base32 encoding and decoding

https://github.com/stesla/base32

Encode and decode binary data using a Base64 representation

https://github.com/ruby/base64

Integrated environment for Bioinformatics written in Ruby

http://bioruby.org/

Collection of miscellaneous utilities for bioinformatics

https://github.com/bioruby/bioruby-executables

Emulate Bio::Fetch object

https://github.com/ngoto/bioruby-old-biofetch-emulator

Command-line interface on BioRuby

https://github.com/bioruby/bioruby-shell

Facilitate programmatic generation of XML markup

https://github.com/tenderlove/builder

Tool that manages gem dependencies for Ruby applications

https://bundler.io/ https://github.com/rubygems/rubygems/tree/master/bundler

Support for the Common Gateway Interface protocol

https://github.com/ruby/cgi

Modern concurrency tools for Ruby

https://ruby-concurrency.github.io/concurrent-ruby/ https://github.com/ruby-concurrency/concurrent-ruby

Gems for cool.io

https://github.com/tarcieri/cool.io

Interface to CSV files and data

https://github.com/ruby/csv

Distributed object system for Ruby

https://github.com/ruby/drb

Fluentd plugin to include format values into json, tsv or csv

https://github.com/tagomoris/fluent-mixin-plaintextformatter

Fluent plugin which provides directives for loop extraction

https://github.com/tagomoris/fluent-plugin-config-expander

Gems for fluent plugin of alternative implementation of out_file

https://rubygems.org/gems/fluent-plugin-file-alternative

Gems for fluent plugin to read whole line into single key

https://github.com/yteraoka/fluent-plugin-tail-asis