Abalone
data tracking and analytics for conservation efforts
ActiveWorkflow.org
turn complex requirements to workflows
AgileVentures
source code to agileventures.org
AirCasting
platform for gathering, visualization and sharing of environmental data
Airesis
eDemocracy
Alaveteli
easy FOIA requests for any jurisdiction
alonetone
home for musicians, their tracks and albums
Amahi
your personal cloud and media server
Astuto
customer feedback tool
Autolab
course management and auto-grading of assignments
Barong
auth server
Binda CMS
headless CMS
Black Candy
self-hosted music streaming server
Brainstormer.online
collaborative brainstorming
brief-ideas
journal for brief ideas
Calls For Proposal App
manage a conference CFP
Case File Editor
editor for digital case files
Catarse
open-source crowdfunding platform
Central
Fulcrum project planning tool fork
CircuitVerse.org
circuit simulator
Clain for Crown Court Defense
advocacy for defense payments
Coderwall
Professional network for software engineers
CodeTriage
directory of open-source projects with open issues
Coinfi
crypto market intelligence platform
consul
open government and participation software
Coursemology
open-source gameified learning platform
Covidlist
connect vaccinations with those who need to be vaccinated
Coyote
image annotation
CrimeThinc.com
the app that powers this website
Cuttlefish
a good-enough SMTP server so you can ditch SMTP providers
Danbooru
taggable image board
Datoji
easy JSON mocking for developers
datorss.com
RSS search
DCAF Case Management
case management system
Diaspora
community-run, distributed social-network
Discourse
next-generation discussion platform
dokno
Rails Engine for storing and managing an app's domain knowledge
Droptune
music notifications for Spotify and Apple Music
Drug Gene Interaction Database
The Genome Institute's drug gene interaction database
Duckrails
tool to mock API endpoints
EasyRaceLapTimer
open-source IR lap time tracker
ebwiki.org
database of police abuse cases against people of color
Email Dashboard
email suite for marketing and CRM
Envizon
network visualization and pentest reporting
Errbit
open source, self-hosted error catcher
exercism.io
code practice and mentorship
Expertiza
peer-reviews app, supported by the National Science Foundation
Fairmondo
free market place in the hand of the users
Fat Free CRM
a clean, customizable CRM
Feedbin
open-source feed reader for multiple platforms
FeedBunch
simple and elegant reader
forem
the platform that powers dev.to
fromthepage.com
crowdsource handwritten documents
getsiteinspector.com
a tool for developers to check their pages
Ghostlight Folio
theatrical production management
GitLab
self hosted Git management
GitReports.com
allow anonymous users to submit bugs to GitHub repos
Growstuff
tool for small-scale food growers
Gwaphics
graphic design tool
Hackathon Manager
hackathon registration and logistics
Hackershare
social bookmarking and knowledge-sharing
Haven
self-hostable private blogging
Helpful
simple and elegant support system
Helpy
A Modern Helpdesk Alternative
Hitobito
full-scale group hierarchy management
Hound
Your code, always in style.
Hours
Time registration that doesn't suck.
huginn
open-source IFTTT
Human Essentials
management system for essentials banks
icare
carpooling platform
if-me.org
mental health communication
iNaturalist.org
social network for nature stuff
Intercity
web-based Dokku deployment
Juvia
commenting server of the likes of Discus or IntenseDebate
Lale Help
collaborative platform for refugee support
LearnAwesome.org
social network of learners
lobsters
link-aggregation site, inspired by Hacker News
Locomotive CMS
a multisite CMS with liquid templating
Mastodon
distributed, interconnected microblogging
Morph.io
web scraping tool
Motor Admin
if ActiveAdmin and Blazer had a baby
nokul
solution for universities to manage all the complex procedures of a university online
Open Build Service
build service for Linux packages
OpenFarm
open database for farming and gardening knowledge
OpenFoodNetwork
software to manage the lifecycle of food
OpenProject
project management system
openSNP
annotate your SNP-set
Open-Source Event Manager
event management tool tailored to conferences
Open Split Time
endurance event data management
openstreetmap.org
crowd-sourced map of the world
Organization for Transformative Works Archive
archives of fanworks, including fanfic, fanart, and fan vids
Outpost
service directories platform
Pig CI
Rails performance monitoring, plus CI
pinballmap.com
source code to pinballmap.com
planningalerts.org.au
planning alerts for Australians
Plylst
Spotify playlist tool
PublicLab.org
collaborative knowledge-exchange platform
Punchclock
simple electronic punch clock
Pupilfirst
everything you need for an online school
Racing On Rails
bike racing association management
RebelsManager
a platform for social good
Recipy.fr
defunct website of a recipe site
Registry
TLD management software
Reservations
equipment loans and reservations software
rubygems.org
The Ruby community's gem hosting service
rubytoolbox.com
catalog of all Rubygems that keeps track of popularity and health metrics
Sanataro
household accounting software
sharetribe
Marketplace platform
ShinyCMS
plugin-based CMS
Skyderby
flight analysis and competition scoring
SmartVPN Billing
billing management for hosting
Snippet Manager
manage your snippets
Spina
A beautiful CMS for Rails developers
StockAid
manages inventory for the Grateful Garment Project
sumofus.org
source code to sumofus.org
TaxonWorks
workbench for biodiversity informatics
Teambox
the original teambox.com
Terrastories
geostorytelling
TheOdinProject.com
free web development courses
TimeOverflow
time banking system
Trado
simple e-commerce platform for developers
Upcase.com
learning platform for programming
vglist.co
video game library tracking
WikiEduDashboard
course dashboard system
World Cube Association
everything for the World Cube Association
zammad
enterprise-ready helpdesk and customer support system