Mastodon
distributed, interconnected microblogging
huginn
open-source IFTTT
Discourse
next-generation discussion platform
GitLab
self hosted Git management
forem
the platform that powers dev.to
Chatwoot
customer engagement platform
Diaspora
community-run, distributed social-network
Postal
mail delivery platform for incoming and outgoing e-mail
Spree
a flexible e-commerce platform
PG Hero
performance dashboard for PostgreSQL
OpenProject
project management system
Canvas LMS
enterprise-grade learning management system
Solidus
e-commerce system
Octobox
GitHub notification manager
Errbit
open source, self-hosted error catcher
Refinery CMS
a modular and extendable CMS
Homeland
homeland.ruby-china.org
Blazer
dashboard for your database
Fat Free CRM
the original Rails-based CRM
Fat Free CRM
a clean, customizable CRM
lobsters
link-aggregation site, inspired by Hacker News
zammad
enterprise-ready helpdesk and customer support system
Feedbin
open-source feed reader for multiple platforms
Comfortable Mexican Sofa
a lovely-named CMS
Carto
location intelligence and data visualization
Redmine
web based project management
Locomotive CMS
a multisite CMS with liquid templating
foreman
server lifecycle automation
sharetribe
Marketplace platform
Helpy
A Modern Helpdesk Alternative
Chaskiq
full-featured live chat, support, and marketing platform
TheOdinProject.com
free web development courses
Loomio
make decisions together
rubygems.org
The Ruby community's gem hosting service
Staytus
status pages
Spina
A beautiful CMS for Rails developers
Hound
Your code, always in style.
Teambox
the original teambox.com
Duckrails
tool to mock API endpoints
Radiant CMS
No-frills CMS
Ciao
uptime monitoring
Danbooru
taggable image board
openstreetmap.org
crowd-sourced map of the world
Catarse
open-source crowdfunding platform
24pullrequests
Give back to open-source
Snippet Manager
manage your snippets
Fulcrum
Original project planning
Pay
payments engine
GitLab CI
continuous integration server
samson
Web interface for deployments
OneBody
church management software
Brimir
an email helpdesk
if-me.org
mental health communication
Classroom
automates repository creation and access control for teachers
CodeTriage
directory of open-source projects with open issues
Astuto
customer feedback tool
consul
open government and participation software
Cuttlefish
a good-enough SMTP server so you can ditch SMTP providers
Decidim
a framework for democracy
Camaleon CMS
yet another content management system
Tracks
software for implementing David Allen's Getting Things Done™ methodology
Juvia
commenting server of the likes of Discus or IntenseDebate
libraries.io
open-source discovery service
Hours
Time registration that doesn't suck.
Organization for Transformative Works Archive
archives of fanworks, including fanfic, fanart, and fan vids
Squash
exception reporting and bug analysis by Square
Black Candy
self-hosted music streaming server
PublicLab.org
collaborative knowledge-exchange platform
OpenFarm
open database for farming and gardening knowledge
OpenFoodNetwork
software to manage the lifecycle of food
Fae CMS
another CMS
Alchemy CMS
popular content management engine
whitehall
government content publishing for gov.uk
RailsCasts
RailsCasts.com source code (thanks Ryan)
Open-Source Event Manager
event management tool tailored to conferences
Storytime
another CMS
Pageflow
multimedia storytelling
Pupilfirst
everything you need for an online school
Autolab
course management and auto-grading of assignments
Open Source Billing
Beautifully Simple Billing Software
Heaven
github flow orchestrator
JobsWorth
Project management, time tracking, billing
ActiveWorkflow.org
turn complex requirements to workflows
Annict.com
anime website
adopt-a-hydrant
adopt-a-hydrant software
Bluedoc
document management tool
Klaxon
get emailed when a website changes
CaseIn
CMS toolkit
CircuitVerse.org
circuit simulator
RailsDevs.com
the RailsDevs.com board
iNaturalist.org
social network for nature stuff
HellRaiser
vulnerability scanner
Motor Admin
if ActiveAdmin and Blazer had a baby
rubytoolbox.com
catalog of all Rubygems that keeps track of popularity and health metrics
Haven
self-hostable private blogging
Envizon
network visualization and pentest reporting
Morph.io
web scraping tool
Trailmix
A place to write.
Calagator
community calendar platform
Hackershare
social bookmarking and knowledge-sharing
Growstuff
tool for small-scale food growers
Action Center
EFF Action Center platform
AppPerf
application and performance monitoring tool
Wreeto
note-taking, knowledge management, and wiki
Orientation.io
Wage war against outdated documentation
Simple Discussion
simple and extensible Rails forum
Concerto
digital signage system
Alaveteli
easy FOIA requests for any jurisdiction
LearnAwesome.org
social network of learners
Workarea
enterprise-grade commerce platform
Plylst
Spotify playlist tool
WikiEduDashboard
course dashboard system
Lewsnetter
email marketing application
Human Essentials
management system for essentials banks
alonetone
home for musicians, their tracks and albums
HyperCable
analytics
Notebook.ai
structured writing tool
Ekylibre
farm management information system
Central
Fulcrum project planning tool fork
CQRS Demo Application
a Rails app using advanced DDD concepts
Hitobito
full-scale group hierarchy management
FoodSoft
manage food coop
Covidlist
connect vaccinations with those who need to be vaccinated
SmartVPN Billing
billing management for hosting
Terrastories
geostorytelling
Upcase.com
learning platform for programming
Bike Index
the internet's bike registry
World Cube Association
everything for the World Cube Association
MarkUs
submission and grading for student assignments
exercism.io
code practice and mentorship
Caffeinate
a framework for easily creating and scheduling email campaigns
Datoji
easy JSON mocking for developers
icare
carpooling platform
Calls For Proposal App
manage a conference CFP
OnRuby
whitelabel for ruby community management
Podify
make podcasts from youtube-dl
getsiteinspector.com
a tool for developers to check their pages
weg.li
report bad german parkers
Coderwall
Professional network for software engineers
FabManager
FabLab management tool
Gwaphics
graphic design tool
Expertiza
peer-reviews app, supported by the National Science Foundation
Gamocosm.com
Minecraft server hosting
Helpful
simple and elegant support system
kitsu
kitsu.io API server
tip4commit.com
reward contributors
openSNP
annotate your SNP-set
E621.net
an art image board
fromthepage.com
crowdsource handwritten documents
Trado
simple e-commerce platform for developers
Notebook Gallery
enterprise Jupyter notebook sharing and collaboration platform
Amahi
your personal cloud and media server
AgileVentures
source code to agileventures.org
Email Dashboard
email suite for marketing and CRM
GitReports.com
allow anonymous users to submit bugs to GitHub repos
Reservations
equipment loans and reservations software
Contributors
contributors.rubyonrails.org
vglist.co
video game library tracking
TheyVoteForYou
Holding politicians accountable
Barong
auth server
Coursemology
open-source gameified learning platform
LumenDatabase
database of legal complaints and requests for removals
TimeOverflow
time banking system
Airesis
eDemocracy
Splits.io
speedrunning data and analysis
FederalRegister.gov
daily journal for the United States Government
Intercity
web-based Dokku deployment
Texterify.com
translation and localization management
Fairmondo
free market place in the hand of the users
Dog API
an API for doggo info
C2
approval process automation
Twist
book review application
Do Continuous Integration Yourself
open-source CI server
EasyRaceLapTimer
open-source IR lap time tracker
Listed.to
online publications with automatic newsletters
Droptune
music notifications for Spotify and Apple Music
Panoptes
API to support user-defined research projects
brief-ideas
journal for brief ideas
CrimeThinc.com
the app that powers this website
Drug Gene Interaction Database
The Genome Institute's drug gene interaction database
CodeCuriosity.org
platform to reward OSS contributors
FeedBunch
simple and elegant reader
TagTeam
social tagging for academics
DCAF Case Management
case management system
ebwiki.org
database of police abuse cases against people of color
BareMetrics.com
v1 of baremtrics.com
RubyTogether.org
RubyTogether.org
planningalerts.org.au
planning alerts for Australians
Skyderby
flight analysis and competition scoring
TaxonWorks
workbench for biodiversity informatics
Violet
automation, CMS, blog, forum and email thing.
CSVLint.io
validate CSV files
StockAid
manages inventory for the Grateful Garment Project
Vinifera
tool to monitor leaked secrets
pinballmap.com
source code to pinballmap.com
Coinfi
crypto market intelligence platform
Binda CMS
headless CMS
RebelsManager
a platform for social good
Huboard.com
better GitHub issues
AirCasting
platform for gathering, visualization and sharing of environmental data
Coyote
image annotation
visualizer.coffee
visualize hipster coffee machines
Pokr
agile estimating and planning
Sanataro
household accounting software
sumofus.org
source code to sumofus.org
Mission of Mercy
management of free dental clinics
nokul
solution for universities to manage all the complex procedures of a university online
Racing On Rails
bike racing association management
uk-postcodes
postcodes application
AskThem
monitor and interact with local government
Verboice
Toolkit for people who literally "need a voice"
FleetYards
A Ship Database and Web API based on the official Star Citizen Ship Matrix
Xrono
asset and time-tracking
OpenSourceRails.org
the codebase to this site
Registry
TLD management software
Abalone
data tracking and analytics for conservation efforts
Convene
digital spaces
Punchclock
simple electronic punch clock
Rescue
save cute cuddly puppies
HRMS
HR management
Hackathon Manager
hackathon registration and logistics
Lale Help
collaborative platform for refugee support
nindika.com
nintendo switch e-shop
Ecosystem Dashboard
open-source ecosystem monitoring
Clain for Crown Court Defense
advocacy for defense payments
Open Split Time
endurance event data management
TalentProtocol.com
be your own NFT
Brainstormer.online
collaborative brainstorming
Pig CI
Rails performance monitoring, plus CI
LocalOrbit
local food management stuff
Outpost
service directories platform
Diveboard
Diveboard.com
dokno
Rails Engine for storing and managing an app's domain knowledge
Recipy.fr
defunct website of a recipe site
Ghostlight Folio
theatrical production management
Case File Editor
editor for digital case files