swap-bot - Swap-bot is a online service that organizes group swaps and a community of creative individuals.
EventsApp - A simple concise app for creating and sharing events.
Postcrossing - A postcard exchange project that invites everyone to send and receive postcards from random places in the world. For free!
Event Hunt - Startups and Tech Events Curated By Locals
InterPals - InterPals is a friendly community of over 5 million friends, language learners, travelers and penpals.
Calendify - Calendify is an event community where you can share, publish, and subscribe to event calendars. It helps you to stay informed about what you are interested in and what is yet to come.