AirCasting
platform for gathering, visualization and sharing of environmental data
platform for gathering, visualization and sharing of environmental data
home for musicians, their tracks and albums
your personal cloud and media server
course management and auto-grading of assignments
auth server
an email helpdesk
digital signage system
community-run, distributed social-network
Diveboard.com
tool to mock API endpoints
email suite for marketing and CRM
network visualization and pentest reporting
code practice and mentorship
peer-reviews app, supported by the National Science Foundation
another CMS
daily journal for the United States Government
manage food coop
crowdsource handwritten documents
Original project planning
continuous integration server
hackathon registration and logistics
full-scale group hierarchy management
open-source IFTTT
Project management, time tracking, billing
commenting server of the likes of Discus or IntenseDebate
email marketing application
online publications with automatic newsletters
link-aggregation site, inspired by Hacker News
web scraping tool
if ActiveAdmin and Blazer had a baby
enterprise Jupyter notebook sharing and collaboration platform
church management software
build service for Linux packages
Beautifully Simple Billing Software
event management tool tailored to conferences
archives of fanworks, including fanfic, fanart, and fan vids
payments engine
crypto currency exchange software
mail delivery platform for incoming and outgoing e-mail
collaborative knowledge-exchange platform
bike racing association management
RailsCasts.com source code (thanks Ryan)
equipment loans and reservations software
Web interface for deployments
household accounting software
Marketplace platform
status pages
Holding politicians accountable
reward contributors
software for implementing David Allen's Getting Things Done™ methodology
simple e-commerce platform for developers
Toolkit for people who literally "need a voice"
government content publishing for gov.uk
course dashboard system
everything for the World Cube Association
asset and time-tracking
enterprise-ready helpdesk and customer support system