Annict.com
anime website
Bike Index
the internet's bike registry
Calagator
community calendar platform
Catarse
open-source crowdfunding platform
Covidlist
connect vaccinations with those who need to be vaccinated
Danbooru
taggable image board
Diaspora
community-run, distributed social-network
ebwiki.org
database of police abuse cases against people of color
Feedbin
open-source feed reader for multiple platforms
forem
the platform that powers dev.to
Hackershare
social bookmarking and knowledge-sharing
Human Essentials
management system for essentials banks
icare
carpooling platform
if-me.org
mental health communication
iNaturalist.org
social network for nature stuff
Juvia
commenting server of the likes of Discus or IntenseDebate
LearnAwesome.org
social network of learners
lobsters
link-aggregation site, inspired by Hacker News
Mastodon
distributed, interconnected microblogging
OneBody
church management software
OpenFoodNetwork
software to manage the lifecycle of food
Open-Source Event Manager
event management tool tailored to conferences
Open Split Time
endurance event data management
Organization for Transformative Works Archive
archives of fanworks, including fanfic, fanart, and fan vids
PublicLab.org
collaborative knowledge-exchange platform
Racing On Rails
bike racing association management
Skyderby
flight analysis and competition scoring
Splits.io
speedrunning data and analysis
Terrastories
geostorytelling
vglist.co
video game library tracking
visualizer.coffee
visualize hipster coffee machines
World Cube Association
everything for the World Cube Association