Discourse
next-generation discussion platform
GitLab
self hosted Git management
zammad
enterprise-ready helpdesk and customer support system
samson
Web interface for deployments
whitehall
government content publishing for gov.uk
Pupilfirst
everything you need for an online school
iNaturalist.org
social network for nature stuff
Envizon
network visualization and pentest reporting
Notebook Gallery
enterprise Jupyter notebook sharing and collaboration platform
FederalRegister.gov
daily journal for the United States Government
Outpost
service directories platform