Postcrossing - A postcard exchange project that invites everyone to send and receive postcards from random places in the world. For free!
Jobs List - All the jobs from job boards in one place
swap-bot - Swap-bot is a online service that organizes group swaps and a community of creative individuals.
FriendsTonight - Meet new friends to join your friends, tonight
Random PenPals - Get a quarantine PenPal in 10 seconds
Wildcard - Discover, connect and meet people at communities