ActiveWorkflow.org
turn complex requirements to workflows
adopt-a-hydrant
adopt-a-hydrant software
Airesis
eDemocracy
Alaveteli
easy FOIA requests for any jurisdiction
alonetone
home for musicians, their tracks and albums
Autolab
course management and auto-grading of assignments
Binda CMS
headless CMS
Case File Editor
editor for digital case files
Central
Fulcrum project planning tool fork
Chaskiq
full-featured live chat, support, and marketing platform
Chatwoot
customer engagement platform
CircuitVerse.org
circuit simulator
Clain for Crown Court Defense
advocacy for defense payments
Classroom
automates repository creation and access control for teachers
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
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
DCAF Case Management
case management system
Diaspora
community-run, distributed social-network
Droptune
music notifications for Spotify and Apple Music
ebwiki.org
database of police abuse cases against people of color
Ekylibre
farm management information system
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
FederalRegister.gov
daily journal for the United States Government
forem
the platform that powers dev.to
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
Heaven
github flow orchestrator
Helpy
A Modern Helpdesk Alternative
Hitobito
full-scale group hierarchy management
Human Essentials
management system for essentials banks
icare
carpooling platform
if-me.org
mental health communication
Intercity
web-based Dokku deployment
libraries.io
open-source discovery service
lobsters
link-aggregation site, inspired by Hacker News
Mastodon
distributed, interconnected microblogging
Morph.io
web scraping tool
Motor Admin
if ActiveAdmin and Blazer had a baby
nindika.com
nintendo switch e-shop
nokul
solution for universities to manage all the complex procedures of a university online
Notebook Gallery
enterprise Jupyter notebook sharing and collaboration platform
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
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
Panoptes
API to support user-defined research projects
Pig CI
Rails performance monitoring, plus CI
pinballmap.com
source code to pinballmap.com
planningalerts.org.au
planning alerts for Australians
Postal
mail delivery platform for incoming and outgoing e-mail
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
Recipy.fr
defunct website of a recipe site
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
Sanataro
household accounting software
sharetribe
Marketplace platform
ShinyCMS
plugin-based CMS
Skyderby
flight analysis and competition scoring
SmartVPN Billing
billing management for hosting
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
TaxonWorks
workbench for biodiversity informatics
Texterify.com
translation and localization management
TheOdinProject.com
free web development courses
TimeOverflow
time banking system
tip4commit.com
reward contributors
Tracks
software for implementing David Allen's Getting Things Done™ methodology
va.gov
API for va.gov
vglist.co
video game library tracking
visualizer.coffee
visualize hipster coffee machines
weg.li
report bad german parkers
WikiEduDashboard
course dashboard system
World Cube Association
everything for the World Cube Association
zammad
enterprise-ready helpdesk and customer support system