Radicale : The Radicale Project is a complete CalDAV (calendar) and CardDAV (contact) server solution.
pump.io : Social server with an ActivityStreams API. It's a stream server that does most of what people really want from a social network.
Mail-in-a-Box : Each Mail-in-a-Box provides webmail and an IMAP/SMTP server for use with mobile devices and desktop mail software. It also includes contacts and calen...
Sourcegraph : Sourcegraph Server is a free, self-hosted code search server that integrates with your code host and supports multi-repository, regexp, and diff searc...
Gitea is a community managed fork of Gogs, lightweight code hosting solution written in Go and published under the MIT license.