Founders Nation - Find or become a startup cofounder
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.
Find A Maker - find a partner for your next project
PenPal World - Connect with people all over the world
CoFoundersLab - Meet 250,000+ entrepreneurs online
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.