Abalone
data tracking and analytics for conservation efforts
ActiveWorkflow.org
turn complex requirements to workflows
AgileVentures
source code to agileventures.org
Alaveteli
easy FOIA requests for any jurisdiction
alonetone
home for musicians, their tracks and albums
Barong
auth server
Bike Index
the internet's bike registry
Brimir
an email helpdesk
Calls For Proposal App
manage a conference CFP
Canvas LMS
enterprise-grade learning management system
Central
Fulcrum project planning tool fork
Clain for Crown Court Defense
advocacy for defense payments
Classroom
automates repository creation and access control for teachers
CodeCuriosity.org
platform to reward OSS contributors
Coderwall
Professional network for software engineers
CodeTriage
directory of open-source projects with open issues
Convene
digital spaces
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
datorss.com
RSS search
Diaspora
community-run, distributed social-network
Ekylibre
farm management information system
Errbit
open source, self-hosted error catcher
exercism.io
code practice and mentorship
Expertiza
peer-reviews app, supported by the National Science Foundation
Fae CMS
another CMS
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
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
Hackathon Manager
hackathon registration and logistics
Hitobito
full-scale group hierarchy management
huginn
open-source IFTTT
Human Essentials
management system for essentials banks
if-me.org
mental health communication
iNaturalist.org
social network for nature stuff
Locomotive CMS
a multisite CMS with liquid templating
Loomio
make decisions together
LumenDatabase
database of legal complaints and requests for removals
Mastodon
distributed, interconnected microblogging
Morph.io
web scraping tool
Notebook Gallery
enterprise Jupyter notebook sharing and collaboration platform
Octobox
GitHub notification manager
OneBody
church management software
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
Open-Source Event Manager
event management tool tailored to conferences
OpenSourceRails.org
the codebase to this site
openstreetmap.org
crowd-sourced map of the world
Organization for Transformative Works Archive
archives of fanworks, including fanfic, fanart, and fan vids
pinballmap.com
source code to pinballmap.com
planningalerts.org.au
planning alerts for Australians
Pokr
agile estimating and planning
PublicLab.org
collaborative knowledge-exchange platform
Punchclock
simple electronic punch clock
Racing On Rails
bike racing association management
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
samson
Web interface for deployments
sharetribe
Marketplace platform
Snippet Manager
manage your snippets
Spina
A beautiful CMS for Rails developers
Splits.io
speedrunning data and analysis
StockAid
manages inventory for the Grateful Garment Project
sumofus.org
source code to sumofus.org
TagTeam
social tagging for academics
TalentProtocol.com
be your own NFT
TaxonWorks
workbench for biodiversity informatics
TimeOverflow
time banking system
tip4commit.com
reward contributors
Tracks
software for implementing David Allen's Getting Things Done™ methodology
Upcase.com
learning platform for programming
whitehall
government content publishing for gov.uk
WikiEduDashboard
course dashboard system
World Cube Association
everything for the World Cube Association
zammad
enterprise-ready helpdesk and customer support system