NZBHydra?

This compliments Sonarr and Radarr so perfectly and is very stable at this point.

https://github.com/theotherp/nzbhydra

As I was setting up my server I realized that the developer has replaced NZBHydra with a new app (Java based) NZBHydra2.

https://github.com/theotherp/nzbhydra2/