Barong
auth server
Bike Index
the internet's bike registry
Black Candy
self-hosted music streaming server
Catarse
open-source crowdfunding platform
CircuitVerse.org
circuit simulator
Coursemology
open-source gameified learning platform
Diaspora
community-run, distributed social-network
EasyRaceLapTimer
open-source IR lap time tracker
ebwiki.org
database of police abuse cases against people of color
Feedbin
open-source feed reader for multiple platforms
forem
the platform that powers dev.to
fromthepage.com
crowdsource handwritten documents
GitLab
self hosted Git management
Helpy
A Modern Helpdesk Alternative
Hitobito
full-scale group hierarchy management
if-me.org
mental health communication
Lewsnetter
email marketing application
OpenProject
project management system
Open Source Billing
Beautifully Simple Billing Software
Open-Source Event Manager
event management tool tailored to conferences
Punchclock
simple electronic punch clock
Racing On Rails
bike racing association management
SmartVPN Billing
billing management for hosting
Trado
simple e-commerce platform for developers
va.gov
API for va.gov
whitehall
government content publishing for gov.uk
World Cube Association
everything for the World Cube Association