Amahi
your personal cloud and media server
Case File Editor
editor for digital case files
Catarse
open-source crowdfunding platform
CodeCuriosity.org
platform to reward OSS contributors
Coderwall
Professional network for software engineers
Errbit
open source, self-hosted error catcher
GitReports.com
allow anonymous users to submit bugs to GitHub repos
Helpful
simple and elegant support system
huginn
open-source IFTTT
Lale Help
collaborative platform for refugee support
Lewsnetter
email marketing application
libraries.io
open-source discovery service
openSNP
annotate your SNP-set
Organization for Transformative Works Archive
archives of fanworks, including fanfic, fanart, and fan vids
sharetribe
Marketplace platform
sumofus.org
source code to sumofus.org
TagTeam
social tagging for academics
Trado
simple e-commerce platform for developers