Abalone
data tracking and analytics for conservation efforts
Action Center
EFF Action Center platform
ActiveWorkflow.org
turn complex requirements to workflows
Annict.com
anime website
C2
approval process automation
Concerto
digital signage system
consul
open government and participation software
Diveboard
Diveboard.com
Drug Gene Interaction Database
The Genome Institute's drug gene interaction database
Expertiza
peer-reviews app, supported by the National Science Foundation
Hitobito
full-scale group hierarchy management
Hours
Time registration that doesn't suck.
huginn
open-source IFTTT
Human Essentials
management system for essentials banks
iNaturalist.org
social network for nature stuff
JobsWorth
Project management, time tracking, billing
LearnAwesome.org
social network of learners
LocalOrbit
local food management stuff
Open Build Service
build service for Linux packages
OpenProject
project management system
Open-Source Event Manager
event management tool tailored to conferences
openstreetmap.org
crowd-sourced map of the world
Pupilfirst
everything you need for an online school
Rescue
save cute cuddly puppies
sharetribe
Marketplace platform
Splits.io
speedrunning data and analysis
Staytus
status pages
TaxonWorks
workbench for biodiversity informatics
TheyVoteForYou
Holding politicians accountable
Upcase.com
learning platform for programming
Verboice
Toolkit for people who literally "need a voice"
zammad
enterprise-ready helpdesk and customer support system