Amahi
your personal cloud and media server
Catarse
open-source crowdfunding platform
Fairmondo
free market place in the hand of the users
Fat Free CRM
a clean, customizable CRM
FederalRegister.gov
daily journal for the United States Government
iNaturalist.org
social network for nature stuff
Organization for Transformative Works Archive
archives of fanworks, including fanfic, fanart, and fan vids
Racing On Rails
bike racing association management
Sanataro
household accounting software
Squash
exception reporting and bug analysis by Square
TagTeam
social tagging for academics