Company Kang Wang created these great apps:
InstaVid - Add Music and Subtitle To Instagram & Vine Video!, Video2Photo - Extract still pictures from your videos, InstaSave for Instagram: Save Your Photos & Videos, InstaSave for Instagram - Repost Videos & Photos from Instagram Free, Quick Upload - Snap Uploader from Camera Roll for Snapchat, Social Picket - Stalker & Spy for Instagram, Get Followers - for Vine, and others..