AgileVentures
source code to agileventures.org
Alaveteli
easy FOIA requests for any jurisdiction
AppPerf
application and performance monitoring tool
Autolab
course management and auto-grading of assignments
Calls For Proposal App
manage a conference CFP
Central
Fulcrum project planning tool fork
CodeCuriosity.org
platform to reward OSS contributors
Coursemology
open-source gameified learning platform
Cuttlefish
a good-enough SMTP server so you can ditch SMTP providers
Diaspora
community-run, distributed social-network
EasyRaceLapTimer
open-source IR lap time tracker
ebwiki.org
database of police abuse cases against people of color
Ekylibre
farm management information system
Email Dashboard
email suite for marketing and CRM
FabManager
FabLab management tool
FederalRegister.gov
daily journal for the United States Government
Gamocosm.com
Minecraft server hosting
HellRaiser
vulnerability scanner
Helpful
simple and elegant support system
Helpy
A Modern Helpdesk Alternative
Hitobito
full-scale group hierarchy management
HRMS
HR management
Lewsnetter
email marketing application
libraries.io
open-source discovery service
Morph.io
web scraping tool
Notebook Gallery
enterprise Jupyter notebook sharing and collaboration platform
OneBody
church management software
Open-Source Event Manager
event management tool tailored to conferences
Racing On Rails
bike racing association management
Registry
TLD management software
Reservations
equipment loans and reservations software
samson
Web interface for deployments
StockAid
manages inventory for the Grateful Garment Project
sumofus.org
source code to sumofus.org
TagTeam
social tagging for academics
TimeOverflow
time banking system
Tracks
software for implementing David Allen's Getting Things Done™ methodology
World Cube Association
everything for the World Cube Association