Baïkal - Cal and CardDAV server
SABnzbd - SABnzbd is a free/open-source cross-platform binary newsreader written in Python.
Radicale - The Radicale Project is a complete CalDAV (calendar) and CardDAV (contact) server solution.
NZBGet - The most efficient usenet downloader.
DAViCal - DAViCal is a server for calendar sharing.
NewsBin - NewsBin Pro is a Usenet NNTP newsreader that downloads and decodes binary file attachments to...