Annict.com
anime website
Barong
auth server
Black Candy
self-hosted music streaming server
Canvas LMS
enterprise-grade learning management system
Catarse
open-source crowdfunding platform
Chaskiq
full-featured live chat, support, and marketing platform
Chatwoot
customer engagement platform
Coderwall
Professional network for software engineers
Coinfi
crypto market intelligence platform
Droptune
music notifications for Spotify and Apple Music
Drug Gene Interaction Database
The Genome Institute's drug gene interaction database
Ekylibre
farm management information system
fromthepage.com
crowdsource handwritten documents
GitLab
self hosted Git management
Loomio
make decisions together
Mastodon
distributed, interconnected microblogging
Notebook Gallery
enterprise Jupyter notebook sharing and collaboration platform
OpenProject
project management system
Open Source Billing
Beautifully Simple Billing Software
openstreetmap.org
crowd-sourced map of the world
rubygems.org
The Ruby community's gem hosting service
rubytoolbox.com
catalog of all Rubygems that keeps track of popularity and health metrics
Skyderby
flight analysis and competition scoring
sumofus.org
source code to sumofus.org
TagTeam
social tagging for academics
Trado
simple e-commerce platform for developers
WikiEduDashboard
course dashboard system
zammad
enterprise-ready helpdesk and customer support system