PenPal World - Connect with people all over the world
Vicinity - High Quality Ambient Background Sounds in your macOS MenuBar
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.
chatback - Automatically connect to people around you & chat
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.
BuddyPress - WordPress social networking in a box.