PenPal World - Connect with people all over the world

Postcrossing - A postcard exchange project that invites everyone to send and receive postcards from random places in the world. For free!

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.

swap-bot - Swap-bot is a online service that organizes group swaps and a community of creative individuals.

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.

Random PenPals - Get a quarantine PenPal in 10 seconds