AgileVentures
source code to agileventures.org
Autolab
course management and auto-grading of assignments
Bike Index
the internet's bike registry
Clain for Crown Court Defense
advocacy for defense payments
CodeTriage
directory of open-source projects with open issues
Convene
digital spaces
Coyote
image annotation
DCAF Case Management
case management system
Diaspora
community-run, distributed social-network
Discourse
next-generation discussion platform
Ecosystem Dashboard
open-source ecosystem monitoring
Fat Free CRM
a clean, customizable CRM
forem
the platform that powers dev.to
Gamocosm.com
Minecraft server hosting
Hours
Time registration that doesn't suck.
Huboard.com
better GitHub issues
lobsters
link-aggregation site, inspired by Hacker News
Loomio
make decisions together
Mastodon
distributed, interconnected microblogging
Open Build Service
build service for Linux packages
OpenProject
project management system
Open Source Billing
Beautifully Simple Billing Software
Open-Source Event Manager
event management tool tailored to conferences
OpenSourceRails.org
the codebase to this site
Open Split Time
endurance event data management
Pay
payments engine
rubygems.org
The Ruby community's gem hosting service
sumofus.org
source code to sumofus.org
TaxonWorks
workbench for biodiversity informatics
Teambox
the original teambox.com
Upcase.com
learning platform for programming
whitehall
government content publishing for gov.uk
World Cube Association
everything for the World Cube Association