Gitify is all about making your life easier. It just does a job. Sitting on your dock or tray it informs you for any GitHub notifications without being annoying and of course without adverts. Works with GitHub Enterprise and multiple accounts.
Gitify will notify you every time you receive a notification by playing a sound (not an annoying one - promise!), by showing a native OSX notification or by just turning its tray icon to green. It is not there to interupt your workflow or distract you at all. It's your buddy.