Astuto
customer feedback tool
Bike Index
the internet's bike registry
Canvas LMS
enterprise-grade learning management system
Catarse
open-source crowdfunding platform
Central
Fulcrum project planning tool fork
Chaskiq
full-featured live chat, support, and marketing platform
CircuitVerse.org
circuit simulator
Concerto
digital signage system
Coursemology
open-source gameified learning platform
Ekylibre
farm management information system
Fairmondo
free market place in the hand of the users
FleetYards
A Ship Database and Web API based on the official Star Citizen Ship Matrix
forem
the platform that powers dev.to
Hackershare
social bookmarking and knowledge-sharing
icare
carpooling platform
iNaturalist.org
social network for nature stuff
Lale Help
collaborative platform for refugee support
MarkUs
submission and grading for student assignments
OpenFoodNetwork
software to manage the lifecycle of food
OpenProject
project management system
Open Source Billing
Beautifully Simple Billing Software
openstreetmap.org
crowd-sourced map of the world
PublicLab.org
collaborative knowledge-exchange platform
Pupilfirst
everything you need for an online school
sharetribe
Marketplace platform
Skyderby
flight analysis and competition scoring
sumofus.org
source code to sumofus.org
tip4commit.com
reward contributors
WikiEduDashboard
course dashboard system
World Cube Association
everything for the World Cube Association