Postcrossing - A postcard exchange project that invites everyone to send and receive postcards from random places in the world. For free!
CoinBundle - Invest in crypto portfolios with one click and zero fees
swap-bot - Swap-bot is a online service that organizes group swaps and a community of creative individuals.
Coinwink - Crypto alerts, watchlist and portfolio tracking app for Bitcoin, Ethereum, and other 3500+ crypto coins and tokens
Random PenPals - Get a quarantine PenPal in 10 seconds
CoinMarketCal - All crypto events that help crypto traders at one place