Muzzy - it’s a tiny and gorgeous iTunes companion that lives on your menu bar. For Mac OSX, its free!
Truecaller - Find a person by a name or phone number worldwide for free using Truecaller.
SpotiMy - Play/Pause and Next/Previous functions for Spotify directly on your Menu Bar!
CallApp - Free Caller ID & Call Blocker app that allows mobile users to block phone calls, identify calls, blacklist unwanted callers and much more.
Bowtie - Bowtie is a desktop accessory that allows you to see and control your music (iTunes, Spotify...
CallerSmart - CallerSmart is an application that is basically used for the purpose of looking up mystery phone numbers for free.