AirCasting
platform for gathering, visualization and sharing of environmental data
Catarse
open-source crowdfunding platform
CodeCuriosity.org
platform to reward OSS contributors
consul
open government and participation software
datorss.com
RSS search
EasyRaceLapTimer
open-source IR lap time tracker
FederalRegister.gov
daily journal for the United States Government
HRMS
HR management
iNaturalist.org
social network for nature stuff
Intercity
web-based Dokku deployment
Listed.to
online publications with automatic newsletters
OneBody
church management software
OpenFoodNetwork
software to manage the lifecycle of food
openSNP
annotate your SNP-set
Open Source Billing
Beautifully Simple Billing Software
Open-Source Event Manager
event management tool tailored to conferences
Organization for Transformative Works Archive
archives of fanworks, including fanfic, fanart, and fan vids
Pokr
agile estimating and planning
PublicLab.org
collaborative knowledge-exchange platform
Pupilfirst
everything you need for an online school
Registry
TLD management software
Reservations
equipment loans and reservations software
SmartVPN Billing
billing management for hosting
TagTeam
social tagging for academics
Teambox
the original teambox.com
Trado
simple e-commerce platform for developers
Vinifera
tool to monitor leaked secrets
whitehall
government content publishing for gov.uk