CleanTimeline - Your Twitter timeline without any distractions or ads
Frysbe - Frysbe: Make global friends at random and the fling app comes up with features to send messages to strangers from every corner of the world to expand your social circle.
Typefully - Write & publish great tweets, without distractions
Unbordered - Unbordered app comes up with features to help you in finding the perfect language practice and exchange partners so you can practice foreign languages right through your mobile phone.
Shipstreams - A list of makers shipping live
PenPal World - Connect with people all over the world