MarkUs
submission and grading for student assignments
Hot off the push and API request, and probably some background jobs.
submission and grading for student assignments
open-source discovery service
workbench for biodiversity informatics
an art image board
next-generation discussion platform
course dashboard system
API for va.gov
self hosted Git management
full-scale group hierarchy management
circuit simulator
customer engagement platform
government content publishing for gov.uk
software to manage the lifecycle of food
build service for Linux packages
Fulcrum project planning tool fork
distributed, interconnected microblogging
project management system
advocacy for defense payments
everything you need for an online school
catalog of all Rubygems that keeps track of popularity and health metrics
a framework for democracy
crowd-sourced map of the world
everything for the World Cube Association
GitHub notification manager
enterprise-ready helpdesk and customer support system
homeland.ruby-china.org
self-hosted music streaming server
structured writing tool
archives of fanworks, including fanfic, fanart, and fan vids
make decisions together
source code to pinballmap.com
open-source gameified learning platform
digital spaces
The Ruby community's gem hosting service
social network for nature stuff
enterprise-grade learning management system
collaborative brainstorming
Give back to open-source
free web development courses
get emailed when a website changes
Automate, optimize, and control your cloud and virtualization services
if ActiveAdmin and Blazer had a baby
the RailsDevs.com board
code practice and mentorship
course management and auto-grading of assignments
TLD management software
simple electronic punch clock
tool for small-scale food growers
e-commerce system
open database for farming and gardening knowledge
be your own NFT
visualize hipster coffee machines
whitelabel for ruby community management
open-source IFTTT
contributors.rubyonrails.org
another CMS
API to support user-defined research projects
full-featured live chat, support, and marketing platform
open-source feed reader for multiple platforms
open government and participation software
kitsu.io API server
A Ship Database and Web API based on the official Star Citizen Ship Matrix
endurance event data management
management system for essentials banks
the platform that powers dev.to
a Rails app using advanced DDD concepts
a platform for social good
case management system
popular content management engine
Web interface for deployments
open-source ecosystem monitoring
the original Rails-based CRM
a clean, customizable CRM
platform for gathering, visualization and sharing of environmental data
community-run, distributed social-network
carpooling platform
the app that powers this website
payments engine
enterprise Jupyter notebook sharing and collaboration platform
easy FOIA requests for any jurisdiction
report bad german parkers
dashboard for your database
source code to agileventures.org
crowdsource handwritten documents
A beautiful CMS for Rails developers
the internet's bike registry
a flexible e-commerce platform
automation, CMS, blog, forum and email thing.
performance dashboard for PostgreSQL
Your code, always in style.
server lifecycle automation
video game library tracking
planning alerts for Australians
anime website
event management tool tailored to conferences
validate CSV files
taggable image board
multimedia storytelling
customer feedback tool
a modular and extendable CMS
database of police abuse cases against people of color
save cute cuddly puppies
flight analysis and competition scoring
yet another content management system
annotate your SNP-set
Marketplace platform
crypto market intelligence platform
mail delivery platform for incoming and outgoing e-mail
digital signage system
manage food coop
A place to write.
manages inventory for the Grateful Garment Project
connect vaccinations with those who need to be vaccinated
mental health communication
geostorytelling
speedrunning data and analysis
database of legal complaints and requests for removals
farm management information system
FabLab management tool
software for implementing David Allen's Getting Things Done™ methodology
network visualization and pentest reporting
link-aggregation site, inspired by Hacker News
self-hostable private blogging
translation and localization management
make podcasts from youtube-dl
learning platform for programming
a framework for easily creating and scheduling email campaigns
an API for doggo info
open source, self-hosted error catcher
peer-reviews app, supported by the National Science Foundation
uptime monitoring
image annotation
Toolkit for people who literally "need a voice"
HR management
the codebase to this site
time banking system
turn complex requirements to workflows
Minecraft server hosting
a tool for developers to check their pages
source code to sumofus.org
Rails Engine for storing and managing an app's domain knowledge
social bookmarking and knowledge-sharing
reward contributors
home for musicians, their tracks and albums
bike racing association management
online publications with automatic newsletters
service directories platform
another CMS
a multisite CMS with liquid templating
Diveboard.com
Beautifully Simple Billing Software
crypto currency exchange software
manage a conference CFP
Holding politicians accountable
collaborative knowledge-exchange platform
location intelligence and data visualization
directory of open-source projects with open issues
nintendo switch e-shop
community calendar platform
music notifications for Spotify and Apple Music
web scraping tool
social network of learners
note-taking, knowledge management, and wiki
data tracking and analytics for conservation efforts
better GitHub issues
RubyTogether.org
Original project planning
free market place in the hand of the users
a good-enough SMTP server so you can ditch SMTP providers
EFF Action Center platform
eDemocracy
web based project management
vulnerability scanner
The Genome Institute's drug gene interaction database
Spotify playlist tool
easy JSON mocking for developers
simple and elegant reader
A Modern Helpdesk Alternative
hackathon registration and logistics
status pages
allow anonymous users to submit bugs to GitHub repos
Wage war against outdated documentation
theatrical production management
platform to reward OSS contributors
enterprise-grade commerce platform
document management tool
plugin-based CMS
auth server
agile estimating and planning
simple and extensible Rails forum
tool to monitor leaked secrets
CMS toolkit
analytics
No-frills CMS
journal for brief ideas
open-source IR lap time tracker
RSS search
church management software
Rails performance monitoring, plus CI
solution for universities to manage all the complex procedures of a university online
your personal cloud and media server
daily journal for the United States Government
commenting server of the likes of Discus or IntenseDebate
open-source crowdfunding platform
application and performance monitoring tool
graphic design tool
local food management stuff
equipment loans and reservations software
household accounting software
Professional network for software engineers
Time registration that doesn't suck.
defunct website of a recipe site
a lovely-named CMS
collaborative platform for refugee support
email suite for marketing and CRM
automates repository creation and access control for teachers
social tagging for academics
v1 of baremtrics.com
tool to mock API endpoints
headless CMS
management of free dental clinics
manage your snippets
web-based Dokku deployment
billing management for hosting
an email helpdesk
book review application
approval process automation
asset and time-tracking
Project management, time tracking, billing
simple e-commerce platform for developers
github flow orchestrator
adopt-a-hydrant software
editor for digital case files
email marketing application
monitor and interact with local government
exception reporting and bug analysis by Square
continuous integration server
postcodes application
simple and elegant support system
open-source CI server
the original teambox.com
RailsCasts.com source code (thanks Ryan)