There is Fit Notifications on Playstore, that works ok. You can select the apps you want to see notifications for. There is also Bitticker but that is no longer on Playstore so you would need to find the apk for it. I use Bitticker myself, neither these apps will give call notifications due to a change made by Fitbit to their app. This is not really an issue because when you set up notifications just use Fitbit for calls and the other app for everything else. I select calendar to none and get calendar notifications through Bitticker
