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PenPal World - Connect with people all over the world
swap-bot - Swap-bot is a online service that organizes group swaps and a community of creative individuals.
Random PenPals - Get a quarantine PenPal in 10 seconds
Postcrossing - A postcard exchange project that invites everyone to send and receive postcards from random places in the world. For free!
Polyglot Club - Polyglot Club is a new social network for language learners.
InterPals - InterPals is a friendly community of over 5 million friends, language learners, travelers and penpals.