Annict.com
anime website
Astuto
customer feedback tool
Calls For Proposal App
manage a conference CFP
Catarse
open-source crowdfunding platform
Central
Fulcrum project planning tool fork
Chatwoot
customer engagement platform
CircuitVerse.org
circuit simulator
Convene
digital spaces
Covidlist
connect vaccinations with those who need to be vaccinated
Coyote
image annotation
Cuttlefish
a good-enough SMTP server so you can ditch SMTP providers
Danbooru
taggable image board
ebwiki.org
database of police abuse cases against people of color
Fairmondo
free market place in the hand of the users
forem
the platform that powers dev.to
Ghostlight Folio
theatrical production management
Hackershare
social bookmarking and knowledge-sharing
Mastodon
distributed, interconnected microblogging
nokul
solution for universities to manage all the complex procedures of a university online
Open Build Service
build service for Linux packages
OpenFarm
open database for farming and gardening knowledge
Open Source Billing
Beautifully Simple Billing Software
Open Split Time
endurance event data management
Organization for Transformative Works Archive
archives of fanworks, including fanfic, fanart, and fan vids
Panoptes
API to support user-defined research projects
Pig CI
Rails performance monitoring, plus CI
planningalerts.org.au
planning alerts for Australians
Pupilfirst
everything you need for an online school
Recipy.fr
defunct website of a recipe site
rubygems.org
The Ruby community's gem hosting service
Skyderby
flight analysis and competition scoring
TagTeam
social tagging for academics
Terrastories
geostorytelling
Texterify.com
translation and localization management
TimeOverflow
time banking system
va.gov
API for va.gov
vglist.co
video game library tracking
Wreeto
note-taking, knowledge management, and wiki
zammad
enterprise-ready helpdesk and customer support system