Vicinity - High Quality Ambient Background Sounds in your macOS MenuBar

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.

chatback - Automatically connect to people around you & chat

Yochat - Yochat app enables users to get to know about strangers from a large number of countries from around the world by video chatting with them.

BuddyPress - WordPress social networking in a box.

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.