Pushbullet for Mac - Send your iOS notifications to your Mac
Raindrop.io - All your articles, photos, video & content from web & apps in one place.
Muzzle - Silence embarrassing notifications while screensharing
Bookmark OS - Bookmark OS is like Mac or Windows optimized for bookmarks.
CleanSpark - Declutter your screen to share it on your next presentation
Superdense - No text, just icons.