CleanTimeline - Your Twitter timeline without any distractions or ads
PenPal World - Connect with people all over the world
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
Anygram - Anygram app offers features that let you meet new people so you can make new foreign friends practice native languages to learn something new.