SABnzbd - SABnzbd is a free/open-source cross-platform binary newsreader written in Python.

FreeFileSync - FreeFileSync is a free open source data backup software that helps you synchronize files and folders on Windows, Linux and macOS.

NZBGet - The most efficient usenet downloader.

rsync - rsync is a file transfer program for Unix systems. rsync uses the "rsync algorithm" which provides a very fast method for bringing remote files into sync.

GrabIt - GrabIt is a free application that enables you to easily find and download content from Usenet news...

GoodSync - GoodSync provides highly reliable file backup and synchronization for both individuals and businesses.