Installation on Linux: https://github.com/nzbget/nzbget/wiki/Installation-on-Linux
There's a docker image here: https://github.com/linuxserver/docker-nzbget
NZBGet is a binary downloader, which downloads files from Usenet based on information given in nzb-files.
NZBGet is written in C++ and is known for its extraordinary performance and efficiency.
NZBGet can be run at almost every platform - classic PCs, NAS, media players, SAT-receivers, WLAN-routers, etc. The download area provides precompiled binaries for Windows, Mac OS X and Linux (compatible with many CPUs and platform variants). For other platforms the program can be compiled from sources.