Autolab
course management and auto-grading of assignments
CircuitVerse.org
circuit simulator
Coinfi
crypto market intelligence platform
Diaspora
community-run, distributed social-network
FabManager
FabLab management tool
GitLab
self hosted Git management
huginn
open-source IFTTT
Human Essentials
management system for essentials banks
if-me.org
mental health communication
LumenDatabase
database of legal complaints and requests for removals
Notebook.ai
structured writing tool
Open Build Service
build service for Linux packages
Open Split Time
endurance event data management
openstreetmap.org
crowd-sourced map of the world
PublicLab.org
collaborative knowledge-exchange platform
rubygems.org
The Ruby community's gem hosting service
Terrastories
geostorytelling
whitehall
government content publishing for gov.uk
zammad
enterprise-ready helpdesk and customer support system