Personally paid for Niagara launcher as I find that to be the far superior launcher to any other I've tried. My second one is Symfonium, the most feature rich and well developed audio player.
Not quite... this is like a general manager app for all those sorts of services. You can use it to manage your overseer, as well as all the other *arr apps. I got my app set up with sabnzbd, sonarr, radarr, tautulli, overseer, tachidesk, tdarr, and prowlarr, I use it to monitor my upcoming movies and TV shows with the built in calendar, or see what recently downloaded. I can also manage my imports. Say a tv show requires manual importing, I can check and add it through the app. It's got a really nice interface and allows me to monitor my active downloads, and I can manually add things to download, or delete directly with my services.