Company Zhaokai Liu created these great apps:
iMusic PlayTune - Free MP3 Music Player & Streamer for YouTube, iMusic PlayTune Pro - MP3 Music Player & Songs Streamer for YouTube, Free Songs Notifier to Download for iTunes (With top 100 hits & preview for YouTube), Free Videos Preview Trailer for YouTube, Tubi Movie Box Pro - Watch Free Movies and TV Shows for YouTube, and others..
